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Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Mar. 31, 2017	May 18, 2017	Sep. 30, 2016
Entity Information [Line Items]
Entity Registrant Name	Booz Allen Hamilton Holding Corp
Entity Central Index Key	0001443646
Document Type	10-K
Document Period End Date	Mar. 31, 2017
Amendment Flag	false
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--03-31
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 4,574,607,371
Common stock, Class A
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		147,920,835
Non-voting common stock, Class B
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		0
Restricted common stock, Class C
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		0
Special voting common stock, Class E
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		0

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Current assets:
Cash and cash equivalents	$ 217,417	$ 187,529
Accounts receivable, net of allowance	991,810	892,289
Prepaid expenses and other current assets	85,253	109,953
Total current assets	1,294,480	1,189,771
Property and equipment, net of accumulated depreciation	139,167	130,169
Deferred income taxes	10,825	22,054
Intangible assets, net of accumulated amortization	271,880	220,658
Goodwill	1,571,190	1,361,913
Other long-term assets	85,563	85,606
Total assets	3,373,105	3,010,171
Current liabilities:
Current portion of long-term debt	193,150	112,813
Accounts payable and other accrued expenses	504,117	484,769
Accrued compensation and benefits	263,816	241,367
Other current liabilities	140,318	100,964
Total current liabilities	1,101,401	939,913
Long-term debt, net of current portion	1,470,174	1,484,448
Income tax reserve	11,647	1,517
Other long-term liabilities	216,292	175,805
Total liabilities	2,799,514	2,601,683
Commitments and contingencies (Note 20)
Stockholders' equity:
Treasury stock, at cost - 7,013,777 shares at March 31, 2017 and 5,398,596 shares at March 31, 2016	(191,900)	(135,445)
Additional paid-in capital	302,907	243,475
Retained earnings	478,102	318,537
Accumulated other comprehensive loss	(17,077)	(19,613)
Total stockholders' equity	573,591	408,488
Total liabilities and stockholders' equity	3,373,105	3,010,171
Common stock, Class A
Stockholders' equity:
Common stock	$ 1,559	$ 1,534

Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2017	Mar. 31, 2016
Treasury stock, shares	7,013,777	5,398,596
Common stock, Class A
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	600,000,000	600,000,000
Common stock, shares issued	155,901,485	153,391,058
Common stock, shares outstanding	148,887,708	147,992,462
Non-voting common stock, Class B
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	16,000,000	16,000,000
Common stock, shares issued	0	0
Common stock, shares outstanding	0	0
Restricted common stock, Class C
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	5,000,000	5,000,000
Common stock, shares issued	0	0
Common stock, shares outstanding	0	0
Special voting common stock, Class E
Common stock, par value	$ 0.003	$ 0.003
Common stock, shares authorized	25,000,000	25,000,000
Common stock, shares issued	0	0
Common stock, shares outstanding	0	0

Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Revenue	$ 5,804,284	$ 5,405,738	$ 5,274,770
Operating costs and expenses:
Cost of revenue	2,691,982	2,580,026	2,593,849
Billable expenses	1,751,077	1,513,083	1,406,527
General and administrative expenses	817,434	806,509	752,912
Depreciation and amortization	59,544	61,536	62,660
Total operating costs and expenses	5,320,037	4,961,154	4,815,948
Operating income	484,247	444,584	458,822
Interest expense	(62,298)	(70,815)	(71,832)
Other, net	(10,049)	5,693	(1,072)
Income before income taxes	411,900	379,462	385,918
Income tax expense	159,410	85,368	153,349
Net income	$ 252,490	$ 294,094	$ 232,569
Earnings per common share (Note 3):
Basic (in dollars per share)	$ 1.69	$ 1.98	$ 1.58
Diluted (in dollars per share)	$ 1.67	$ 1.94	$ 1.52

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 66,253	$ 55,590	$ 62,830	$ 67,817	$ 65,517	$ 108,055	$ 56,216	$ 64,306	$ 252,490	$ 294,094	$ 232,569
Change in postretirement plan costs, net of tax									2,536	2,546	(15,523)
Comprehensive income									$ 255,026	$ 296,640	$ 217,046

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities
Net income	$ 252,490	$ 294,094	$ 232,569
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	59,544	61,536	62,660
Stock-based compensation expense	21,249	24,992	26,163
Deferred income taxes	15,536	3,549	(2,543)
Excess tax benefits from stock-based compensation	(18,175)	(31,924)	(50,800)
Amortization of debt issuance costs and loss on extinguishment	15,566	8,359	11,582
Losses on dispositions and impairments	4,673	547	1,541
Changes in assets and liabilities:
Accounts receivable	(87,154)	(31,229)	60,533
Income taxes receivable / payable	54,564	(4,170)	36,456
Prepaid expenses and other current assets	(115)	24,873	(1,591)
Other long-term assets	(10,146)	(49,060)	(8,240)
Accrued compensation and benefits	21,535	(8,409)	(44,329)
Accounts payable and other accrued expenses	14,846	4,911	(35,443)
Accrued interest	(806)	(2,829)	5,262
Income tax reserves	(91)	(56,927)	1,038
Other current liabilities	13,256	66,031	5,127
Other long-term liabilities	25,505	(55,110)	9,973
Net cash provided by operating activities	382,277	249,234	309,958
Cash flows from investing activities
Purchases of property and equipment	(53,919)	(66,635)	(36,041)
Payments for business acquisitions, net of cash acquired	(247,627)	(51,118)	(24,534)
Insurance proceeds received for damage to equipment	650	0	0
Net cash used in investing activities	(300,896)	(117,753)	(60,575)
Cash flows from financing activities
Proceeds from issuance of common stock	6,314	5,977	5,020
Stock option exercises	14,687	7,962	6,099
Excess tax benefits from stock-based compensation	18,175	31,924	50,800
Repurchases of common stock	(46,548)	(63,152)	(62,140)
Cash dividends paid	(92,925)	(80,015)	(215,094)
Dividend equivalents paid to option holders	(2,254)	(31,802)	(47,110)
Repayment of debt	(968,325)	(295,063)	(279,563)
Proceeds from debt issuance	1,019,383	273,000	239,828
Net cash used in financing activities	(51,493)	(151,169)	(302,160)
Net increase (decrease) in cash and cash equivalents	29,888	(19,688)	(52,777)
Cash and cash equivalents-beginning of year	187,529	207,217	259,994
Cash and cash equivalents-end of year	217,417	187,529	207,217
Supplemental disclosures of cash flow information
Interest	49,062	57,068	50,074
Income taxes	89,556	143,083	122,912
Supplemental disclosures of non-cash investing and financing activities
Share repurchases transacted but not settled and paid	9,907	0	0
Contingent consideration arising from businesses acquired	$ 3,576	$ 0	$ 0

Consolidated Statements of Stockholders Equity Statement - USD ($) $ in Thousands	Total	Common stock, Class A	Common Stock Common stock, Class A	Common Stock Non-voting common stock, Class B	Common Stock Restricted common stock, Class C	Common Stock Special voting common stock, Class E	Treasury Stock	Additional Paid-in Capital	(Accumulated Deficit) Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balance (shares) at Mar. 31, 2014			143,962,073	582,080	935,871	4,424,814	(609,625)
Balance at Mar. 31, 2014	$ 171,636		$ 1,440	$ 6	$ 9	$ 13	$ (10,153)	$ 144,269	$ 42,688	$ (6,636)
Issuance of common stock, in shares			1,365,008
Issuance of common stock	5,020		$ 14					5,006
Stock options exercised, in shares			3,392,643			(2,573,225)
Stock options exercised	6,099		$ 33			$ (7)		6,073
Excess tax benefits from the exercise of stock options	50,800							50,800
Share exchange, in shares			1,517,951	(582,080)	(935,871)
Share exchange	0		$ 15	$ (6)	$ (9)
Repurchase of common stock, in shares							(2,389,768)
Repurchase of common stock	(62,140)						$ (62,140)
Recognition of liability related to future stock option exercises (Note 17)	(13,032)							(13,032)
Net income	232,569								232,569
Change in postretirement plan costs, net of tax	(15,523)									(15,523)
Comprehensive income	217,046
Dividends paid	(215,094)							(44,294)	(170,800)
Stock-based compensation expense	26,163							26,163
Balance (shares) at Mar. 31, 2015			150,237,675	0	0	1,851,589	(2,999,393)
Balance at Mar. 31, 2015	186,498		$ 1,502	$ 0	$ 0	$ 6	$ (72,293)	174,985	104,457	(22,159)
Issuance of common stock, in shares			443,813
Issuance of common stock	5,977		$ 4					5,973
Stock options exercised, in shares			2,709,570			(1,851,589)
Stock options exercised	7,962		$ 28			$ (6)		7,940
Excess tax benefits from the exercise of stock options	31,924							31,924
Share exchange	0
Repurchase of common stock, in shares		(2,100,000)					(2,399,203)
Repurchase of common stock	(63,152)	$ (54,900)					$ (63,152)
Recognition of liability related to future stock option exercises (Note 17)	(2,339)							(2,339)
Net income	294,094								294,094
Change in postretirement plan costs, net of tax	2,546									2,546
Comprehensive income	296,640
Dividends paid	(80,014)							0	(80,014)
Stock-based compensation expense	24,992							24,992
Balance (shares) at Mar. 31, 2016			153,391,058	0	0	0	(5,398,596)
Balance at Mar. 31, 2016	408,488		$ 1,534	$ 0	$ 0	$ 0	$ (135,445)	243,475	318,537	(19,613)
Issuance of common stock, in shares			578,932
Issuance of common stock	6,314		$ 6					6,308
Stock options exercised, in shares			1,931,495			0
Stock options exercised	14,687		$ 19			$ 0		14,668
Excess tax benefits from the exercise of stock options	18,175							18,175
Repurchase of common stock, in shares		(1,306,388)					(1,615,181)
Repurchase of common stock	(56,455)	$ (46,400)					$ (56,455)
Recognition of liability related to future stock option exercises (Note 17)	(968)							(968)
Net income	252,490								252,490
Change in postretirement plan costs, net of tax	2,536									2,536
Comprehensive income	255,026
Dividends paid	(92,925)								(92,925)
Stock-based compensation expense	21,249							21,249
Balance (shares) at Mar. 31, 2017			155,901,485	0	0	0	(7,013,777)
Balance at Mar. 31, 2017	$ 573,591		$ 1,559	$ 0	$ 0	$ 0	$ (191,900)	$ 302,907	$ 478,102	$ (17,077)

Business Overview	12 Months Ended
Business Overview	Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BUSINESS OVERVIEW	BUSINESS OVERVIEW Our Business Booz Allen Hamilton Holding Corporation, including its wholly owned subsidiaries, or Holding, the Company or we, us, and our, was incorporated in Delaware in May 2008. The Company provides management and technology consulting, engineering, analytics, digital solutions, mission operations, and cyber expertise to U.S. and international governments, major corporations, and not-for-profit organizations. The Company reports operating results and financial data in one operating segment. The Company is headquartered in McLean, Virginia, with approximately 23,300 employees as of March 31, 2017.

Summary of Significant Accounting Policies	12 Months Ended
Summary of Significant Accounting Policies	Mar. 31, 2017
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation The accompanying consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries, and have been prepared in accordance with accounting principles generally accepted in the United States, or U.S. GAAP, and the rules and regulations of the U.S. Securities and Exchange Commission, or SEC. All intercompany balances and transactions have been eliminated in consolidation. The consolidated financial statements and notes of the Company include its subsidiaries, and the joint ventures and partnerships over which the Company has a controlling financial interest. The Company uses the equity method to account for investments in entities that it does not control if it is otherwise able to exert significant influence over the entities' operating and financial policies. The Company’s fiscal year ends on March 31 and unless otherwise noted, references to fiscal year or fiscal are for fiscal years ended March 31. The accompanying consolidated financial statements present the financial position of the Company as of March 31, 2017 and 2016 and the Company’s results of operations for fiscal 2017, fiscal 2016, and fiscal 2015. Certain amounts reported in the Company's prior year consolidated financial statements have been reclassified to conform to the current year presentation. Use of Estimates The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements, and the reported amounts of revenue and expenses during the reporting periods. Areas of the consolidated financial statements where estimates may have the most significant effect include contractual and regulatory reserves, valuation and lives of tangible and intangible assets, contingent consideration related to business acquisitions, impairment of long-lived assets, accrued liabilities, revenue recognition and costs to complete fixed-price contracts, bonus and other incentive compensation, stock-based compensation, reserves for tax benefits and valuation allowances on deferred tax assets, provisions for income taxes, postretirement obligations, certain deferred costs, collectability of receivables, and loss accruals for litigation. Actual results experienced by the Company may differ materially from management's estimates. Revenue Recognition Substantially all of the Company’s revenue is derived from services and solutions provided to the U.S. government and its agencies, primarily by the Company’s consulting staff and, to a lesser extent, subcontractors. The Company generates its revenue from the following types of contractual arrangements: cost-reimbursable-plus-fee contracts, time-and-materials contracts, and fixed-price contracts. Revenue on cost-reimbursable-plus-fee contracts is recognized as services are performed, generally based on the allowable costs incurred during the period plus any recognizable earned fee. The Company considers fixed fees under cost-reimbursable-plus-fee contracts to be earned in proportion to the allowable costs incurred in performance of the contract. For cost-reimbursable-plus-fee contracts that include performance-based fee incentives, which are principally award fee arrangements, the Company recognizes income when such fees are probable and estimable. Estimates of the total fee to be earned are made based on contract provisions, prior experience with similar contracts or clients, and management’s evaluation of the performance on such contracts. Revisions to these estimates may result in increases or decreases to revenue and income, and are reflected in the consolidated financial statements in periods in which they are identified. Historically, revisions to these estimates have not had a material effect on our results of operations. Contract costs, including indirect expenses, are subject to audit by the Defense Contract Audit Agency, or DCAA, and, accordingly, are subject to possible cost disallowances. Executive compensation that we determine to be allowable for cost reimbursement based on management's estimates is recognized as revenue, net of reserves. Management's estimates in this regard are based on a number of factors that may change over time, including executive compensation survey data, our and other government contractors' experiences with the DCAA audit practices in our industry, and relevant decisions of courts and boards of contract appeals. Revenue earned under time-and-materials contracts is recognized as hours are worked based on contractually billable rates to the client. Costs on time-and-materials contracts are expensed as incurred. Revenue on fixed-price contracts is primarily recognized using the percentage of completion method based on actual costs incurred relative to total estimated costs for the contract. On some fixed-price contracts the Company may use an alternative input method to calculate the percent complete, such as labor hours or labor dollars. This method is used when a contract contains significant, up-front material purchases resulting in costs incurred that are not representative of the actual progress on the contract. In either method, these estimated costs are updated during the term of the contract, and may result in revision by the Company of recognized revenue and estimated costs in the period in which the changes in estimated costs are identified. Historically, revisions to these estimates have not had a material effect on our results of operations. Profits on fixed-price contracts result from the difference between incurred costs used to calculate the percentage of completion and revenue earned. Contract accounting requires significant judgment relative to assessing risks, estimating contract revenue and costs, and making assumptions for schedule and technical issues. Due to the size and nature of many of the Company’s contracts, developing total revenue and cost at completion estimates requires the use of significant judgment. Contract costs include direct labor and billable expenses and an allocation of allowable indirect costs. Billable expenses is comprised of subcontracting costs and other “out of pocket” costs that often include, but are not limited to, travel-related costs and telecommunications charges. The Company typically recognizes revenue and billable expenses from these transactions on a gross basis when it is the primary obligor on our contracts with customers. Assumptions regarding the length of time to complete the contract also include expected increases in wages and prices for materials. Estimates of total contract revenue and costs are monitored during the term of the contract and are subject to revision as the contract progresses. Anticipated losses on contracts are recognized in the period they are deemed probable and can be reasonably estimated. The Company’s contracts may include the delivery of a combination of one or more of the Company’s service offerings. In these situations, the Company determines whether such arrangements with multiple service offerings should be treated as separate units of accounting based on how the elements are bid or negotiated, whether the customer can accept separate elements of the arrangement, and the relationship between the pricing on the elements individually and combined. All other revenues are recognized when persuasive evidence of an arrangement exists, services or products have been provided to the customer, the sales price is fixed or determinable and collectability is reasonably assured. Cash and Cash Equivalents Cash and cash equivalents include operating cash on hand and highly liquid investments having a weighted average maturity of 60 days or less and a weighted average life of 120 days or less. The Company’s cash equivalents consist primarily of institutional and government money market funds. The Company maintains its cash and cash equivalents in bank accounts that, at times, exceed the federally insured FDIC limits. The Company has not experienced any losses in such accounts. Valuation of Accounts Receivable The Company maintains allowances for doubtful accounts against certain billed and unbilled receivables based upon the latest information regarding whether specific charges are recoverable or invoices are ultimately collectible. Assessing the recoverability of charges and collectability of customer receivables requires management judgment. The Company determines its allowance for doubtful accounts by specifically analyzing individual accounts receivable, historical bad debts, customer credit-worthiness, current economic conditions, accounts receivable aging trends for billed receivables, availability of funding, compliance with contractual terms and conditions, client satisfaction with work performed, and other factors impacting unbilled receivables. Valuation reserves are periodically re-evaluated and adjusted as more information about the ultimate recoverability and collectability of accounts receivable becomes available. Upon determination that a receivable is uncollectible, the receivable balance and any associated reserve are written off. Concentrations of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash equivalents and accounts receivable. The Company’s cash equivalents are generally invested in prime or U.S. government money market funds. The Company believes that credit risk for accounts receivable is limited as the receivables are primarily with the U.S. government. Property and Equipment Property and equipment are recorded at cost, and the balances are presented net of accumulated depreciation. The cost of software purchased or internally developed is capitalized, as appropriate. Depreciation is calculated using the straight-line method over the estimated useful lives of the assets. Furniture and equipment is depreciated over five to ten years, computer equipment is depreciated over four years, and software purchased or developed for internal use is depreciated over three to five years. Leasehold improvements are amortized over the shorter of the useful life of the asset or the lease term. Maintenance and repairs are charged to expense as incurred. Rent expense is recorded on a straight-line basis over the life of the respective lease. The difference between the cash payment and rent expense is recorded as deferred rent in either accounts payable and other accrued expenses or other long-term liabilities in the consolidated balance sheets, depending on when the amounts will be recognized. The Company receives incentives for tenant improvements on certain of its leases. The cash expended on such improvements is recorded as property and equipment and amortized over the life of the associated asset, or lease term, whichever is shorter. Incentives for tenant improvements are recorded as deferred rent in either accounts payable and other accrued expenses or other long-term liabilities in the consolidated balance sheets depending on when the amounts will be recognized. Incentives for tenant improvements are amortized on a straight-line basis over the lease term. Business Combinations The accounting for the Company’s business combinations consists of allocating the purchase price to tangible and intangible assets acquired and liabilities assumed based on their estimated fair values, with the excess recorded as goodwill. The Company has up to one year from the acquisition date to use information as of each acquisition date to adjust the fair value of the acquired assets and liabilities which may result in material changes to their recorded values with an offsetting adjustment to goodwill. We have a contingent consideration arrangement in connection with a business acquisition which requires a fair value measurement determined using probability-weighted cash flows. See Note 18 to our consolidated financial statements for further information about the valuation of the contingent consideration liability and the inputs used in the fair value measurement. Intangible Assets Intangible assets primarily consist of the Company's trade name, customer relationships, and other amortizable intangible assets. Customer relationships are amortized on an accelerated basis over the expected life based on projected future cash flows of approximately seven to twelve years. The Company's trade name is not amortized, but is tested for impairment on at least an annual basis as of January 1 and more frequently if interim indicators of impairment exist. The trade name is considered to be impaired if the carrying value exceeds its estimated fair value. The Company used the relief from royalty method to estimate the fair value. The fair value of the asset is the present value of the license fees avoided by owning the asset, or the royalty savings. During the fiscal year ended March 31, 2017, the Company recorded impairment charges related to intangible assets acquired in an acquisition. During the fiscal year ended March 31, 2016, and 2015, the Company did not record any impairment of intangible assets. Goodwill The Company assesses goodwill for impairment on at least an annual basis on January 1 unless interim indicators of impairment exist. Goodwill is considered to be impaired when the net book value of a reporting unit exceeds its estimated fair value. The Company operates as a single operating segment and as a single reporting unit for the purpose of evaluating goodwill. As of January 1, 2017, the Company performed its annual impairment test of goodwill by comparing the fair value of the Company (based on market capitalization) to the carrying value of the Company's net equity, and concluded that the fair value of the reporting unit was significantly greater than the carrying amount. During the fiscal years ended March 31, 2017, 2016, and 2015, the Company did not record any impairment of goodwill. Long-Lived Assets The Company reviews its long-lived assets, including property and equipment and amortizable intangible assets, for impairment whenever events or changes in circumstances indicate that the carrying amounts of the assets may not be fully recoverable. If the total of the expected undiscounted future net cash flows is less than the carrying amount of the asset, a loss is recognized for any excess of the carrying amount over the fair value of the asset. During the fiscal years ended March 31, 2017, 2016, and 2015, the Company did not record any impairment charges. Income Taxes The Company provides for income taxes as a “C” corporation on income earned from operations. The Company is subject to federal, state, and foreign taxation in various jurisdictions. Deferred tax assets and liabilities are recorded to recognize the expected future tax benefits or costs of events that have been, or will be, reported in different years for financial statement purposes than for tax purposes. Deferred tax assets and liabilities are computed based on the difference between the consolidated financial statement carrying amount and tax basis of assets and liabilities using enacted tax rates and laws for the years in which these items are expected to reverse. If management determines that some portion or all of a deferred tax asset is not “more likely than not” to be realized, a valuation allowance is recorded as a component of the income tax provision to reduce the deferred tax asset to an appropriate level in that period. In determining the need for a valuation allowance, management considers all positive and negative evidence, including historical earnings, projected future taxable income, future reversals of existing taxable temporary differences, taxable income in prior carryback periods, and prudent, feasible tax-planning strategies. The Company periodically assesses its tax positions for all periods open to examination by tax authorities based on the latest available information. Where it is not more likely than not that the Company’s tax position will be sustained, the Company records its best estimate of the resulting tax liability, penalties, and interest in the consolidated financial statements. These uncertain tax positions are recorded as a component of income tax expense. As uncertain tax positions in periods open to examination are closed out, or as new information becomes available, the resulting change is reflected in the recorded liability and income tax expense. Penalties and interest recognized related to the reserves for uncertain tax positions are recorded as a component of income tax expense. Comprehensive Income Comprehensive income is the change in equity of a business enterprise during a period from transactions and other events and circumstances from nonowner sources, and is presented in the consolidated statements of comprehensive income. Accumulated other comprehensive loss as of March 31, 2017 and 2016 consisted of net unrealized losses on the Company’s defined and postretirement benefit plans. Share-Based Payments Share-based payments to employees are recognized in the consolidated statements of operations based on their grant date fair values with the expense recognized on an accelerated basis over the vesting period. The Company uses the Black-Scholes option-pricing model to determine the fair value of its awards at the time of the grant. Defined Benefit Plan and Other Postretirement Benefits The Company recognizes the underfunded status of defined benefit plans on the consolidated balance sheets within other long-term liabilities. Gains and losses, and prior service costs and credits that have not yet been recognized through net periodic benefit cost are recognized in accumulated other comprehensive income (loss), net of tax effects, and will be amortized as a component of net periodic cost in future periods. The measurement date, the date at which the benefit obligations are measured, is the Company’s fiscal year-end. The Company also offers medical and dental benefits to inactive employees (and their eligible dependents) on long-term disability. These benefits do not vary with an employee's years of service; therefore, the Company is required to accrue the costs of the benefits at the date the inactive employee become disability eligible and elects to participate in the benefit. The accrued cost for such benefits is calculated using an actuarial estimate of the present value of all future benefit payments for obligations at the end of the fiscal year. During the three months ended March 31, 2017 the Company identified misstatements related to unrecognized accrued costs, goodwill, deferred tax assets, and related effects on earnings associated with these benefits in previously issued consolidated financial statements. The Company evaluated the effects of the misstatements to the Company's current and prior period consolidated financial statements and determined the impact was immaterial. As result, the effects of the immaterial misstatements have been corrected in the current period. Refer to Notes 5, 12 and 13 for further discussion. Self-Funded Medical Plans The Company maintains self-funded medical insurance. Self-funded plans include Consumer Driven Health Plans with a Health Savings Account option and traditional choice plans. Further, self-funded plans also include prescription drug and dental benefits. The Company records an incurred but unreported claim liability in the accrued compensation and benefits line of the consolidated balance sheets for self-funded plans based on an actuarial valuation. The estimate of the incurred but unreported claim liability was provided by a third-party valuation firm, primarily based on claims and participant data for the medical, dental, and pharmacy related costs. Fair Value Measurements Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. In determining fair value, we consider the principal or most advantageous market in which the asset or liability would transact, and if necessary, consider assumptions that market participants would use when pricing the asset or liability. The accounting guidance for fair value measurements establishes a three-level fair value hierarchy that prioritizes the inputs used in measuring fair value as follows: observable inputs such as quoted prices in active markets (Level 1); inputs other than quoted prices in active markets that are observable either directly or indirectly (Level 2); and unobservable inputs in which there is little or no market data, which requires the Company to develop its own assumptions (Level 3). Assets and liabilities are classified in their entirety within the fair value hierarchy based on the lowest level input that is significant to the fair value measurement. See Note 18 to our consolidated financial statements for additional information on the Company’s fair value measurements. Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (FASB) issued a new standard that will replace existing revenue recognition standards and significantly expand the disclosure requirements for revenue arrangements. In July 2015, the FASB approved a one year delay in the effective date of the standard, which will now be effective for the Company beginning on April 1, 2018 (i.e., beginning with the first quarter fiscal 2019 interim financial statements). The Company anticipates adopting the new revenue standard using the full retrospective transition method; however, the Company's ability to adopt using the full retrospective method is dependent on system and process readiness and the completion of our analysis of information necessary to recast our prior period financial statements. A dedicated implementation team has been established that continues to make progress toward completing the evaluation of the impact of the new standard. An initial accounting assessment of the new standard has been completed and the Company is not currently expecting significant changes related to recognizing revenue and earnings over time for long-term contracts as work progresses because of the continuous transfer of control to the customer, generally using an input measure (e.g., costs incurred) to reflect progress. The Company is also continuing to evaluate the impact of the new standard in other areas, including contract modifications and estimation and recognition of variable consideration for contracts to provide services. The Company is in the process of quantifying the financial statement impacts, revising current accounting policies, evaluating changes to internal controls, and determining the appropriate changes to business processes. In March 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting, which simplifies several aspects of the accounting for share-based payment transactions including the accounting for income taxes, forfeitures, and statutory tax withholding requirements. The ASU is effective for annual reporting periods beginning after December 15, 2016, with early adoption permitted. The Company plans to adopt ASU 2016-09 in the first quarter of fiscal 2018. In February 2016, the FASB issued ASU 2016-02, Leases, to increase transparency and comparability of accounting for lease transactions. The new standard requires lessees to recognize lease assets and lease liabilities on their balance sheet for all leases with a lease term of greater than 12 months. Lessor accounting is largely unchanged. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, with early adoption permitted. The Company is assessing what effect the adoption of this standard may have on the consolidated financial statements. Other recent accounting pronouncements issued by the FASB during fiscal 2017 and through the filing date did not and are not believed by management to have a material impact on the Company's present or historical consolidated financial statements.

Earnings Per Share

12 Months Ended

Mar. 31, 2017

Earnings Per Share [Abstract]

EARNINGS PER SHARE

The Company computes basic and diluted earnings per share amounts based on net income for the periods presented. The Company uses the weighted average number of common shares outstanding during the period to calculate basic earnings per share, or EPS. Diluted EPS adjusts the weighted average number of shares outstanding to include the dilutive effect of outstanding common stock options and other stock-based awards.

The Company currently has outstanding shares of Class A Common Stock. The Company purchased, at par value, all issued and outstanding shares of Class E Special Voting Common Stock in connection with the exercise of the final tranche of rollover options during the second quarter of fiscal 2016. Class E Special Voting Common Stock shares are not included in the calculation of EPS as these shares represent voting rights only and are not entitled to participate in dividends or other distributions. During fiscal 2015, the Company converted all issued and outstanding shares of Class B Non-Voting Common Stock and Class C Restricted Common Stock into shares of Class A Common Stock on a one-for-one basis. Unvested Class A Restricted Common Stock holders are entitled to participate in non-forfeitable dividends or other distributions. These unvested restricted shares participated in the Company's dividends declared and paid in each quarter of fiscal 2017, 2016, and 2015. As such, EPS is calculated using the two-class method whereby earnings are reduced by distributed earnings as well as any available undistributed earnings allocable to holders of unvested restricted shares. A reconciliation of the income used to compute basic and diluted EPS for the periods presented are as follows:



	Fiscal Year Ended March 31,
	2017		2016		2015
Earnings for basic computations (1)	$	250,231	$	290,542	$	229,093
Weighted-average Class A Common Stock outstanding	148,218,968		146,494,407		144,809,906
Weighted-average Class B Non-Voting Common Stock outstanding	—		—		222,129
Weighted-average Class C Restricted Common Stock outstanding	—		—		382,085
Total weighted-average common shares outstanding for basic computations	148,218,968		146,494,407		145,414,120
Earnings for diluted computations (1)	$	250,249	$	290,596	$	229,101
Dilutive stock options and restricted stock	2,055,672		3,224,730		4,961,411
Average number of common shares outstanding for diluted computations	150,274,640		149,719,137		150,375,531
Earnings per common share
Basic	$	1.69	$	1.98	$	1.58
Diluted	$	1.67	$	1.94	$	1.52

(1) During fiscal 2017, 2016, and 2015 approximately 1.3 million, 1.8 million, and 2.2 million shares of participating securities were paid dividends totaling $0.9 million, $1.0 million, and $3.2 million, respectively. For fiscal 2017 there were undistributed earnings of $1.4 million allocated to the participating class of securities in basic and diluted earnings per share, respectively. For fiscal 2016 there were undistributed earnings of $2.5 million allocated to the participating class of securities in both basic and diluted earnings per share, respectively. For fiscal 2015 there were undistributed earnings of $0.3 million and $0.2 million allocated to the participating class of securities in basic and diluted earnings per share, respectively. The allocated undistributed earnings and the dividends paid comprise the difference between net income presented on the consolidated statements of operations and earnings for basic and diluted computations for fiscal 2017, 2016 and 2015.

The EPS calculation for fiscal 2017, 2016, and 2015 excludes 0.05 million, 0.6 million, and 0.3 million options as their impact was anti-dilutive.

Acquisition

12 Months Ended

Mar. 31, 2017

Business Combinations [Abstract]

Acquisition

ACQUISITION

On January 24, 2017, the Company acquired eGov Holdings, Inc., which we refer to as "Aquilent". As a result of the transaction, eGov Holdings, Inc. became a wholly owned subsidiary of Booz Allen Hamilton Inc. Aquilent is an architect of IT solutions for the U.S. Federal government. We expect the acquisition will further expand the Company's ability to blend its consulting heritage with advanced technical expertise.

The acquisition of Aquilent was accounted for under the acquisition method of accounting, which requires the total acquisition consideration to be allocated to the assets acquired and liabilities assumed based on an estimate of the acquisition date fair value, with the difference reflected in goodwill.

The following table summarizes the preliminary determination of the total consideration transferred at the acquisition date of January 24, 2017:



Cash purchase price paid to Aquilent shareholders	$	250,000
Working capital and other closing adjustments	(1,570		)
Acquired cash on hand	2,998
Acquisition-related compensation expenses	(1,291		)
Acquisition-related contingent consideration	3,576
Total estimated purchase consideration and liabilities paid at closing	$	253,713

As part of the acquisition, the Company and Aquilent agreed to jointly make an election under Section 338(h)(10) of the Internal Revenue Code (Section 338(h)(10)) to treat the acquisition as an asset purchase for income tax purposes and as part of the acquisition, the Company agreed to indemnify the selling stockholders for potential, incremental increases in income taxes and related costs as a result of the Section 338(h)(10) election. The indemnity is evaluated to be acquisition-related contingent consideration, which is preliminarily estimated at the acquisition date fair value of $3.6 million. The acquisition-related contingent consideration was estimated using probability-weighted cash flows and Level 3 inputs as described under the fair value hierarchy of ASC 820, Fair Value Measurements ("ASC 820").

Under the terms of the purchase agreement, the Company has 120 days after closing to provide proposed post-closing working capital adjustments to the stockholders' representatives on behalf of the selling stockholders, which are subject to dispute by the stockholders' representatives. The final purchase price allocations will be completed after the underlying information has been finalized and agreed upon by the stockholders' representatives and the Company. Preliminary transaction costs were $4.0 million, which were recorded as incurred, primarily as general and administrative expense.

The Company recorded, on a preliminary basis, the assets acquired and liabilities assumed at their acquisition date fair value, with the difference between the fair value of the net assets acquired and the acquisition consideration reflected as goodwill. The following table represents the preliminary fair value of assets acquired and liabilities assumed as of the acquisition date:



Preliminary allocation:
Current assets	$	15,809
Other tangible assets	1,144
Customer-relationship intangible assets	69,000
Goodwill	199,830
Current liabilities	(8,295		)
Tax indemnification liability	(13,554		)
Income tax uncertainty	(10,221		)
Estimated total purchase consideration and liabilities paid at closing	$	253,713

The identifiable customer-relationship intangible assets of $69 million was valued using the excess earnings method discounted cash flow approach, incorporating Level 3 inputs as described under the fair value hierarchy of ASC 820. These unobservable inputs reflect the Company's own assumptions about which assumptions market participants would use in pricing an asset on a non-recurring basis. This asset is expected to be amortized over the estimated useful life of 12 years.

As part of the acquisition, the Company agreed to contractually reimburse the selling stockholders for previously unrealized tax consequences on Aquilent's prior tax-return positions that become realized with the acquisition. Accordingly, the Company recognized a tax indemnification liability of $13.6 million. The Company also recognized a related reserve of $10.2 million for income tax uncertainties created with the acquisition resulting from uncertainties in the sustainability of Aquilent's prior tax-return positions under examination with the relevant tax authorities.

The goodwill of $199.8 million is primarily attributed to the specialized workforce and the expected synergies between the Company and Aquilent. The majority of the goodwill is expected to be deductible for tax purposes.

The fair values of assets acquired and liabilities assumed are preliminary and based on valuation estimates and assumptions that are subject to change and could result in material changes since the timing of the acquisition and related judgments required to make certain valuation estimates could necessitate the use of the one year measurement period to adequately analyze and assess a number of factors used in establishing the fair value of the net assets acquired. Although the Company does not currently expect material changes to the initial value of net assets acquired, the Company continues to evaluate assumptions associated with the customer-relationship intangible, assumptions underlying income tax related liabilities and contingent consideration, and working capital adjustments.

Pro forma results of operations for this acquisition are not presented because it is not material to the Company's consolidated results of operations.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Goodwill and Intangible Assets

12 Months Ended

Mar. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND INTANGIBLE ASSETS

Goodwill

As of March 31, 2017 and 2016, goodwill was $1,571.2 million and $1,361.9 million, respectively. The increase in the carrying amount of goodwill was attributable to the Company's acquisition of Aquilent as discussed in Note 4 and an increase of $9.4 million as a result of the correction of the immaterial misstatement discussed in Note 2.

The Company performed an annual impairment test of goodwill as of January 1, 2017 and 2016, and did not identify any impairment.

Intangible Assets

Intangible assets consisted of the following:



	March 31, 2017						March 31, 2016
	Gross Carrying Value		Accumulated Amortization		Net Carrying Value		Gross Carrying Value		Accumulated Amortization		Net Carrying Value
Amortizable intangible assets:
Customer relationships and other amortizable intangible assets	$	274,915	$	193,235	$	81,680	$	209,759	$	179,301	$	30,458

Unamortizable intangible assets:
Trade name	$	190,200	$	—	$	190,200	$	190,200	$	—	$	190,200

Total	$	465,115	$	193,235	$	271,880	$	399,959	$	179,301	$	220,658

Intangible assets are primarily amortized on an accelerated basis over periods ranging from 7 years to 12 years. The weighted-average remaining period of amortization for all customer relationships is 11 years.

The Company performed an annual impairment test of the trade name as of January 1, 2017 and 2016, and did not identify any impairment. However, the Company recognized an impairment charge of $3.8 million in fiscal 2017 for acquired technology, customer relationships and other intangible assets associated with a historical business acquisition.

Amortization expense for fiscal 2017, 2016, and 2015 was $13.9 million, $12.1 million, and $10.7 million, respectively. The following table summarizes the estimated annual amortization expense for future periods indicated below:



For the Fiscal Year Ended March 31,
2018	$	16,026
2019	13,742
2020	11,004
2021	9,011
2022	7,647
Thereafter	24,250
Total estimated amortization expense	$	81,680

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Accounts Receivable, Net

12 Months Ended

Mar. 31, 2017

Receivables [Abstract]

ACCOUNTS RECEIVABLE, NET

Accounts receivable, net consisted of the following:



	March 31,
	2017		2016
Current
Accounts receivable–billed	$	340,716	$	308,670
Accounts receivable–unbilled	651,094		584,275
Allowance for doubtful accounts	—		(656		)
Accounts receivable, net	991,810		892,289
Long-term
Accounts receivable–unbilled	59,913		51,145
Total accounts receivable, net	$	1,051,723	$	943,434

Unbilled amounts represent revenues for which billings have not been presented to customers at year end. These amounts are usually billed and collected within one year. Long-term unbilled receivables not anticipated to be billed and collected within one year, which are primarily related to retainage, holdbacks, and long-term rate settlements to be billed at contract closeout, are included in other long-term assets in the accompanying consolidated balance sheets. The Company recognized a provision (benefit) for doubtful accounts (including certain unbilled reserves) of $0.6 million, $1.1 million, and $(1.0) million for fiscal 2017, 2016, and 2015, respectively.

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References + Details

Property and Equipment, Net

12 Months Ended

Mar. 31, 2017

Property, Plant and Equipment [Abstract]

PROPERTY AND EQUIPMENT, NET

The components of property and equipment, net were as follows:



	March 31,
	2017			2016
Furniture and equipment	$	151,552		$	145,292
Computer equipment	75,159			69,075
Software	48,361			48,316
Leasehold improvements	177,009			155,803
Total	452,081			418,486
Less: Accumulated depreciation and amortization	(312,914		)	(288,317		)
Property and equipment, net	$	139,167		$	130,169

Property and equipment, net, includes $8.1 million and $6.9 million of internally developed software, net of depreciation as of March 31, 2017 and 2016, respectively. Depreciation and amortization expense relating to property and equipment for fiscal 2017, 2016, and 2015 was $46.3 million, $50.1 million, and $52.7 million, respectively. During fiscal 2017 and 2016, the Company reduced the gross cost and accumulated depreciation and amortization by $11.9 million and $6.6 million, respectively, for zero net book value assets deemed no longer in service.

Accounts Payable and Other Accrued Expenses

12 Months Ended

Mar. 31, 2017

Payables and Accruals [Abstract]

ACCOUNTS PAYABLE AND OTHER ACCRUED EXPENSES

Accounts payable and other accrued expenses consisted of the following:



	March 31,
	2017		2016
Vendor payables	$	268,630	$	246,670
Accrued expenses	235,487		238,099
Total accounts payable and other accrued expenses	$	504,117	$	484,769

Accrued expenses consisted primarily of the Company’s reserve related to potential cost disallowance in conjunction with government audits. Refer to Note 20 for further discussion of this reserve.

Deferred Payment Obligation

12 Months Ended

Mar. 31, 2017

Other Liabilities Disclosure [Abstract]

DEFERRED PAYMENT OBLIGATION

Pursuant to an Agreement and Plan of Merger, or the Merger Agreement, dated as of May 15, 2008, and subsequently amended, The Carlyle Group indirectly acquired all of the issued and outstanding stock of the Company. In connection with this transaction, on July 31, 2008 the Company established a Deferred Payment Obligation, or DPO, of $158.0 million, payable 8.5 years after the Closing Date, or until settlement of all outstanding claims, less any settled claims. Pursuant to the Merger Agreement, $78.0 million of the $158.0 million DPO was required to be paid in full to the selling shareholders. On December 11, 2009, in connection with a recapitalization transaction, $100.4 million was paid to the selling shareholders, of which $78.0 million was the repayment of that portion of the DPO, with approximately $22.4 million representing accrued interest.

The remaining $80.0 million is available to indemnify the Company for certain pre-acquisition tax contingencies, related interest and penalties, and other matters pursuant to the Merger Agreement. Any amounts remaining after the settlement of all claims will be paid out to the selling shareholders. During fiscal 2016, the Company effectively settled approximately $56.9 million of its pre-acquisition uncertain tax positions, thereby relieving an amount of approximately $21.4 million that was previously indemnified under the DPO. As of March 31, 2016, there were no estimated tax indemnified amounts recorded against the DPO. Remaining potential claims outstanding that may be indemnified pursuant to the Merger Agreement relate to former officers and stockholders’ suits that are still in litigation (See Note 20).

During fiscal 2017, the Company accrued interest at a rate of 5% per six-month period on the unpaid DPO balance, net of any settled claims or payments, which was $80.0 million as of March 31, 2017 and 2016. Accordingly, the $81.3 million and $81.3 million recorded within other current liabilities as of March 31, 2017 and March 31, 2016, respectively, represent the residual balances estimated to be paid to the selling shareholders subject to any remaining potential claims based on consideration of accrued interest and other matters.

A reconciliation of the principal balance of the DPO to the amount recorded in the consolidated balance sheets for the periods presented are as follows:



	March 31,
	2017		2016
Deferred payment obligation:	$	80,000	$	80,000
Indemnified pre-acquisition uncertain tax positions	—		(21,407		)
Release of indemnified pre-acquisition uncertain tax positions	—		21,407
Accrued interest	1,304		1,319
Amount recorded in the consolidated balance sheet	$	81,304	$	81,319

The Company paid $8.0 million in each of fiscal 2017 and 2016 of accrued interest to the selling shareholders.

Accrued Compensation and Benefits

12 Months Ended

Mar. 31, 2017

ACCRUED COMPENSATION AND BENEFITS

Accrued compensation and benefits consisted of the following:



	March 31,
	2017		2016
Bonus	$	77,765	$	73,040
Retirement	31,879		30,388
Vacation	124,486		114,599
Other	29,686		23,340
Total accrued compensation and benefits	$	263,816	$	241,367

- Definition

The entire disclosure for compensation costs, including compensated absences accruals, compensated absences liability, deferred compensation arrangements and income statement compensation items. Deferred compensation arrangements may include a description of an arrangement with an individual employee, which is generally an employment contract between the entity and a selected officer or key employee containing a promise by the employer to pay certain amounts at designated future dates, usually including a period after retirement, upon compliance with stipulated requirements. This type of arrangement is distinguished from broader based employee benefit plans as it is usually tailored to the employee. Disclosure also typically includes the amount of related compensation expense recognized during the reporting period, the number of shares (units) issued during the period under such arrangements, and the carrying amount as of the balance sheet date of the related liability.

+ References + Details

Debt

12 Months Ended

Mar. 31, 2017

Debt Disclosure [Abstract]

DEBT

Debt consisted of the following:



	March 31, 2017					March 31, 2016
	Interest Rate		Outstanding Balance			Interest Rate		Outstanding Balance
Term Loan A	2.98	%	$	1,153,425		2.94	%	$	741,813
Term Loan B	3.08	%	398,000			3.75	%	841,188
Revolving credit facility (ABR)	5.00	%	80,000			5.00	%	35,000
Revolving credit facility (LIBOR)	2.98	%	50,000			—	%	—
Less: Unamortized debt issuance costs and discount on debt			(18,101		)			(20,740		)
Total			1,663,324					1,597,261
Less: Current portion of long-term debt			(193,150		)			(112,813		)
Long-term debt, net of current portion			$	1,470,174				$	1,484,448

On July 13, 2016 and February 6, 2017, Booz Allen Hamilton Inc. ("Booz Allen Hamilton"), Booz Allen Hamilton Investor Corporation ("Investor") and certain wholly-owned subsidiaries of Booz Allen Hamilton entered into the Third Amendment (the “Third Amendment”) and the Fourth Amendment (the "Fourth Amendment), respectively, to the Credit Agreement (the “Credit Agreement”), dated as of July 31, 2012, among Booz Allen Hamilton, Investor, certain wholly owned subsidiaries of Booz Allen Hamilton and Bank of America, N.A., as Administrative Agent, Collateral Agent and Issuing Lender (as previously amended by the First Amendment to the Credit Agreement, dated as of August 16, 2013 and the Second Amendment to the Credit Agreement, dated as of May 7, 2014). Pursuant to the Third Amendment, Booz Allen Hamilton borrowed approximately $441 million of additional Term Loan A, with such funds used to pay off a portion of the Term Loan B facility. The Third Amendment also extended the maturity date of Term Loan A and the termination date for the revolving credit facility to June 30, 2021 and extended the maturity date of Term Loan B to June 30, 2023. The Third Amendment also amended certain existing debt covenants to provide greater operational and financial flexibility. Pursuant to the Fourth Amendment, the Company reduced the interest rate spread applicable to Term Loan B. The interest rate spread applicable to Term Loan A remained unchanged.

Prior to the Fourth Amendment, $399 million was outstanding under Term Loan B. Pursuant to the Fourth Amendment, certain lenders converted their existing Term Loan B loans into a new tranche of Term Loan B loans in an aggregate amount, along with Term Loan B loans advanced by certain new lenders, of approximately $399 million. The proceeds from the new lenders were used to prepay in full all of the existing Term Loan B Loans that were not converted into the new Term Loan B tranche.

In connection with the Third and Fourth Amendments, the Company accelerated the amortization of ratable portions of the amortization of debt issuance costs (DIC) and original issue discount (OID) that did not qualify for deferral of approximately $5.5 million and $0.1 million, respectively. These expenses are reflected in other income (expense), net in fiscal 2017. Furthermore, the Company expensed third party debt issuance costs and creditor fees of approximately $3.4 million and $0.9 million in connection with the Third and Fourth Amendments, respectively, that did not qualify for deferral and are reflected in general and administrative costs in fiscal 2017.

As of March 31, 2017, the Credit Agreement, as amended, provided the Company with a $1,153 million Term Loan A and a $398.0 million Term Loan B, and a $500.0 million revolving credit facility, (the “Revolving Credit Facility”) with a sub-limit for letters of credit of $100.0 million. Booz Allen Hamilton’s obligations and the guarantors’ guarantees under the Credit Agreement, as amended, are secured by a first priority lien on substantially all of the assets (including capital stock of subsidiaries) of Booz Allen Hamilton, Investor and the subsidiary guarantors, subject to certain exceptions set forth in the Credit Agreement, as amended, and related documentation. Subject to specified conditions, without the consent of the then-existing lenders (but subject to the receipt of commitments), the Term Loans or Revolving Credit Facility may be expanded (or a new term loan facility or revolving credit facility added to the existing facilities) by up to (i) $400.0 million plus (ii) the aggregate principal amount under which pro forma consolidated net secured leverage remains less than or equal to 3.50:1.00.

Booz Allen Hamilton occasionally borrows under the Revolving Credit Facility in anticipation of cash demands. During fiscal 2017 and 2016, Booz Allen Hamilton accessed a total of $575.0 million and $273.0 million, respectively, of its $500.0 million Revolving Credit Facility. As of March 31, 2017, $130.0 million was outstanding on the Revolving Credit Facility. As of March 31, 2016, $35.0 million was outstanding on the Revolving Credit Facility. See Note 24.

The Credit Agreement, as amended, requires quarterly principal payments of 1.25% of the stated principal amount of Term Loan A until maturity, and quarterly principal payments of 0.25% of the stated principal amount of Term Loan B until maturity.

The following table summarizes required future debt principal repayments on the term loans:



	Payments Due By March 31,
	Total		2018		2019		2020		2021		2022		Thereafter
Term Loan A	$	1,153,425	$	59,150	$	59,150	$	59,150	$	59,150	$	916,825	$	—
Term Loan B	398,000		4,000		4,000		4,000		4,000		4,000		378,000
Total	$	1,551,425	$	63,150	$	63,150	$	63,150	$	63,150	$	920,825	$	378,000

At Booz Allen Hamilton’s option, borrowings under the Secured Credit Facility bear interest based either on LIBOR (adjusted for maximum reserves, and subject to a floor of zero) for the applicable interest period or a base rate (equal to the highest of (x) the administrative agent’s prime corporate rate, (y) the overnight federal funds rate plus 0.50% and (z) three-month LIBOR (adjusted for maximum reserves, and subject to a floor of zero) plus 1.00%), in each case plus an applicable margin, payable at the end of the applicable interest period and in any event at least quarterly. The applicable margin for Term Loan B is 2.25% for LIBOR loans and 1.25% for base rate loans. The applicable margin for Term Loan A and borrowings under the Revolving Credit Facility ranges from 1.50% to 2.25% for LIBOR loans and 0.50% to 1.25% for base rate loans, in each case based on the Booz Allen Hamilton’s consolidated total net leverage ratio. Unused commitments under the Revolving Credit Facility are subject to a quarterly fee ranging from 0.30% to 0.40% based on Booz Allen Hamilton’s consolidated total net leverage ratio.

The Credit Agreement, as amended, contains customary representations and warranties and customary affirmative and negative covenants. The negative covenants include limitations on the following, in each case subject to certain exceptions: (i) indebtedness and liens, (ii) mergers, consolidations or amalgamations, liquidations, wind-ups or dissolutions, and disposition of all or substantially all assets; (iii) dispositions of property; (iv) restricted payments; (v) investments; (vi) transactions with affiliates; (vii) sale and lease back transactions; (viii) change in fiscal periods; (ix) negative pledges; (x) restrictive agreements; (xi) line of business; and (xii) speculative hedging. The events of default include the following, in each case subject to certain exceptions: (a) failure to make required payments under the Secured Credit Facility; (b) material breaches of representations or warranties under the Secured Credit Facility; (c) failure to observe covenants or agreements under the Secured Credit Facility; (d) failure to pay or default under certain other material indebtedness; (e) bankruptcy or insolvency; (f) certain ERISA events; (g) certain material judgments; (h) actual or asserted invalidity of the Guarantee and Collateral Agreements or the other security documents or failure of the guarantees or perfected liens thereunder; and (i) a change of control. In addition, Booz Allen Hamilton is required to meet certain financial covenants at each quarter end, namely Consolidated Net Total Leverage and Consolidated Net Interest Coverage Ratios. As of March 31, 2017 and 2016, Booz Allen Hamilton was in compliance with all of these covenants.

During fiscal 2017, interest payments of $28.8 million and $19.5 million were made for Term Loan A and Term Loan B, respectively. During fiscal 2016, interest payments of $22.0 million and $34.7 million were made for Term Loan A and Term Loan B, respectively.

Interest on debt and debt-like instruments consisted of the following:



	Fiscal Year Ended March 31,
	2017		2016		2015
	(In thousands)
Term Loan A Interest Expense	$	28,646	$	21,790	$	22,189
Term Loan B Interest Expense	18,874		32,070		33,079
Interest on Revolving Credit Facility	751		363		68
Deferred Payment Obligation Interest ¹	7,985		8,015		8,000
Amortization of Debt Issuance Costs (DIC) and Original Issue Discount (OID) ²	5,683		8,359		8,331
Other	359		218		165
Total Interest Expense	$	62,298	$	70,815	$	71,832

¹ Interest payments on the deferred payment obligation are made twice a year in January and July. See Note 10.

² DIC and OID on the Company's term loans are recorded as a reduction of long-term debt in the consolidated balance sheet and are amortized ratably over the life of the related debt using the effective rate method. DIC on the Company's revolving line of credit is recorded as a long term asset on the consolidated balance sheet and amortized ratably over the term of the revolving credit facility.

Income Taxes Income Taxes

12 Months Ended

Mar. 31, 2017

Income Tax Disclosure [Abstract]

INCOME TAXES

The components of income tax expense were as follows:



	Fiscal Year Ended March 31,
	2017			2016			2015
Current
U.S. Federal	$	119,601		$	61,339		$	133,400
State and local	24,273			20,480			22,492
Total current	143,874			81,819			155,892
Deferred
U.S. Federal	18,451			8,664			(2,938		)
State and local	(2,915		)	(5,115		)	395
Total deferred	15,536			3,549			(2,543		)
Total	$	159,410		$	85,368		$	153,349

A reconciliation of the provision for income tax to the amount computed by applying the statutory federal income tax rate to income from continuing operations before income taxes for each of the three years ended March 31 is as follows:



	Fiscal Year Ended March 31,
	2017			2016			2015
Income tax expense computed at U.S. federal statutory rate (35%)	$	144,165		$	132,812		$	135,071
Increases (reductions) resulting from:
Changes in uncertain tax positions	(92		)	(56,428		)	1,038
State and local income taxes, net of federal tax	13,882			10,092			15,039
Meals and entertainment	1,328			1,321			1,513
Other	127			(2,429		)	688
Income tax expense from operations	$	159,410		$	85,368		$	153,349

The significant components of the Company’s deferred income tax assets and liabilties were as follows:



	March 31,
	2017			2016
Deferred income tax assets:
Accrued expenses	$	85,459		$	85,412
Accrued compensation	41,421			35,950
Stock-based compensation	15,326			20,032
Pension and postretirement benefits	48,672			46,743
Property and equipment	3,885			14,760
Capital loss carryforwards	246			283
Deferred rent and tenant allowance	25,167			20,964
Extended disability benefits	8,860			—
Other	6,817			4,793
Total gross deferred income tax assets	235,853			228,937
Less: Valuation allowance	—			—
Total net deferred income tax assets	235,853			228,937
Deferred income tax liabilities:
Unbilled receivables	(141,357		)	(122,744		)
Intangible assets	(78,871		)	(80,604		)
Debt issuance costs	(4,709		)	(3,354		)
Other	(91		)	(181		)
Total deferred income tax liabilities	(225,028		)	(206,883		)
Net deferred income tax asset	$	10,825		$	22,054

Deferred tax balances arise from temporary differences between the carrying amount of assets and liabilities and their tax basis and are stated at the enacted tax rates in effect for the year in which the differences are expected to reverse. A valuation allowance is provided against deferred tax assets when it is more likely than not that some or all of the deferred tax asset will not be realized. In determining if the Company's deferred tax assets are realizable, management considers all positive and negative evidence, including the history of generating financial reporting earnings, future reversals of existing taxable temporary differences, projected future taxable income, as well as any tax planning strategies. As discussed in Note 2, the Company recognized deferred income tax assets of $8.9 million associated with the correction of an immaterial misstatement with the medical and dental benefits provided to employees and their eligible dependents on long-term disability. The Company believes it is more likely than not that the results of future operations will generate sufficient taxable income to realize the net deferred tax assets.

As of March 31, 2017, the Company has no State net operating loss or NOL carryforwards.

Uncertain Tax Positions

The Company maintains reserves for uncertain tax positions related to income tax benefits recognized. These reserves involve considerable judgment and estimation and are evaluated by management based on the best information available including changes in tax laws and other information. As of March 31, 2017, 2016, and 2015, the Company has recorded $11.6 million, $1.5 million, and $58.4 million, respectively, of reserves for uncertain tax positions which includes potential tax benefits of $1.4 million, $1.4 million, and $55.2 million respectively, that, when recognized, impact the effective tax rate. As discussed in Note 4, the Company has a pre-acquisition tax uncertainty that was recorded in purchase accounting in the amount of $10.2 million.

For the fiscal year ended March 31, 2016, the Company's reserves for uncertain tax positions decreased primarily as a result of expired statute of limitations for a prior tax year and management's conclusion that the uncertain tax positions related to the statute lapse were effectively settled. The Company released approximately $56.9 million of its pre-acquisition uncertain tax positions during fiscal 2016, including $3.2 million of net interest and penalties that were incurred by the Company subsequent to the acquisition. This resulted in a decrease in the Company's effective tax rate for fiscal 2016. As part of this settlement, an amount of $21.4 million, previously indemnified under the remaining available DPO was relieved. As of March 31, 2016, there were no estimated tax indemnified amounts recorded against the DPO.

A reconciliation of the beginning and ending amount of potential tax benefits for the periods presented is as follows:



	March 31,
	2017			2016			2015
Beginning of year	$	1,449		$	55,164		$	54,966
Increases in prior year position	127			79			27
Increases in current year position	10,278			—			203
Settlements with taxing authorities	—			(2,581		)	(32		)
Lapse of statute of limitations	(266		)	(51,213		)	—
End of year	$	11,588		$	1,449		$	55,164

The Company recognized accrued (released) interest and penalties of $(9) thousand, $(3.2) million and $0.8 million for fiscal 2017, 2016, and 2015, respectively, related to the reserves for uncertain tax positions in the income tax provision. Included in the total reserve for uncertain tax positions are accrued penalties and interest of approximately $0.1 million, $0.1 million and $3.3 million at March 31, 2017, 2016, and 2015 respectively.

The Company is subject to taxation in the United States and various state and foreign jurisdictions. As of March 31, 2017, the Company's tax years ended March 31, 2013 and forward are open and subject to examination by the federal tax authorities. The other jurisdictions currently open or under examination are not considered to be material.

Employee Benefit Plans

12 Months Ended

Mar. 31, 2017

Compensation and Retirement Disclosure [Abstract]

EMPLOYEE BENEFIT PLANS

Defined Contribution Plan

The Company sponsors the Employees’ Capital Accumulation Plan, or ECAP, which is a qualified defined contribution plan that covers eligible U.S. and international employees. The ECAP provides for distributions, subject to certain vesting provisions, to participants by reason of retirement, death, disability, or termination of employment. Effective April 1, 2014, the Company transitioned from a discretionary employer contribution to an annual matching contribution of up to 6% of eligible annual income as determined by the Internal Revenue Code for the ECAP. Total expense recognized under ECAP for fiscal 2017, 2016, and 2015 was $116.6 million, $108.7 million, and $110.7 million, respectively, and the Company-paid contributions were $114.8 million, $107.5 million, and $124.8 million, respectively.

Defined Benefit Plan and Other Postretirement Benefit Plans

The Company provides postretirement healthcare benefits to former officers under a medical indemnity insurance plan, with premiums paid by the Company. This plan is referred to as the Officer Medical Plan. The Company also established a non-qualified defined benefit plan for all officers in May 1995, or the Retired Officers' Bonus Plan, which pays a lump-sum amount of $10,000 per year of service as an officer, provided the officer meets retirement vesting requirements. The Company also provides a fixed annual allowance after retirement to cover financial counseling and other expenses. The Retired Officers' Bonus Plan is not salary related, but rather is based primarily on years of service. In the fourth quarter of fiscal 2017, the Company adopted a new plan which will provide for a one-time, lump sum retirement payment of one month’s salary when a vice-president retires from the Company, effective April 1, 2017. This is referred to as the Retired Vice-President Bonus Plan.

The Company recognizes a liability for the defined benefit plans' underfunded status, measures the defined benefit plans' obligations that determine its funded status as of the end of the fiscal year, and recognizes as a component of accumulated other comprehensive income the changes in the defined benefit plans' funded status that are not recognized as components of net periodic benefit cost.The components of net postretirement medical expense for the Officer Medical Plan were as follows:



	Fiscal Year Ended March 31,
	2017		2016		2015
Service cost	$	4,851	$	5,702	$	4,086
Interest cost	4,782		4,505		3,568
Net actuarial loss	3,052		3,536		582
Total postretirement medical expense	$	12,685	$	13,743	$	8,236

The weighted-average discount rate used to determine the year-end benefit obligations was as follows:



	Fiscal Year Ended March 31,
	2017		2016		2015
Officer Medical Plan	4.30	%	4.25	%	4.25	%
Retired Officers’ Bonus Plan	4.30	%	4.25	%	4.25	%
Retired Vice Presidents' Bonus Plan	4.30	%	—	%	—	%

Assumed healthcare cost trend rates for the Officer Medical Plan at March 31, 2017 and 2016 were as follows:



Pre-65 initial rate	2017		2016
Healthcare cost trend rate assumed for next year	7.25	%	7.50	%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	4.50	%	4.50	%
Year that the rate reaches the ultimate trend rate	2024		2024



Post-65 initial rate	2017		2016
Healthcare cost trend rate assumed for next year	8.50	%	9.00	%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	4.50	%	4.50	%
Year that the rate reaches the ultimate trend rate	2024		2024

Assumed healthcare cost trend rates have a significant effect on the amounts reported for the healthcare plans. A one-percentage-point change in assumed healthcare cost trend rates calculated as of March 31, 2017 would have the following effects:



	1% Increase		1% Decrease
Effect on total of service and interest cost	$	2,160	$	(1,667	)
Effect on postretirement benefit obligation	20,446		(16,374		)

Total defined benefit plan expense, consisting of service, interest, and net actuarial gain associated with the Retired Officers' Bonus Plan was $0.7 million, $0.7 million, and $0.7 million for fiscal 2017, 2016, and 2015, respectively. Benefits paid associated with the Retired Officers’ Bonus Plan were $0.9 million, $0.3 million, and $1.3 million for fiscal 2017, 2016, and 2015, respectively. The end-of-period benefit obligation of $4.4 million and $4.5 million as of March 31, 2017 and 2016, respectively, is included in postretirement obligations within other long-term liabilities in the accompanying consolidated balance sheets. The projected benefit obligation associated with the Retired Vice-President Bonus Plan was $1.0 million as of March 31, 2017, which was recorded as postretirement obligations within other long-term liabilities in the accompanying consolidated balance sheets.

Accumulated other comprehensive loss for fiscal 2017 includes unrecognized gross actuarial gain and prior service cost of $1.1 million, reduced by taxes of $0.4 million, that has not yet been recognized in net periodic pension cost for fiscal 2017 for the Retired Officers’ Bonus Plan, the Officer Medical Plan, and the Retired Vice-President Bonus Plan. Accumulated other comprehensive loss includes unrecognized gross actuarial gain of $0.7 million, reduced by taxes of $0.3 million for fiscal 2016 that has not yet been recognized in net periodic pension cost for the Retired Officers’ Bonus Plan and the Officer Medical Plan.

The amounts in accumulated other comprehensive loss expected to be recognized as components of net periodic cost in fiscal 2018 are $2.3 million of net actuarial loss, $0.1 million of net prior service cost, and $0 of net transition (asset) obligation.

The changes in the benefit obligation, plan assets, and funded status of the Officer Medical Plan were as follows:



	Fiscal Year Ended March 31,
	2017			2016			2015
Benefit obligation, beginning of the year	$	114,008		$	107,317		$	75,902
Service cost	4,851			5,702			4,086
Interest cost	4,782			4,505			3,568
Net actuarial (gain) loss	(2,219		)	(496		)	26,293
Benefits paid	(3,333		)	(3,020		)	(2,532		)
Benefit obligation, end of the year	$	118,089		$	114,008		$	107,317



	Fiscal Year Ended March 31,
Changes in plan assets	2017			2016			2015
Fair value of plan assets, beginning of the year	$	—		$	—		$	—
Employer contributions	3,333			3,020			2,532
Benefits paid	(3,333		)	(3,020		)	(2,532		)
Fair value of plan assets, end of the year	$	—		$	—		$	—

As of March 31, 2017 and 2016, the unfunded status of the Officer Medical Plan was $118.1 million and $114.0 million, respectively, which is included in other long-term liabilities in the accompanying consolidated balance sheets.

Funded Status for Defined Benefit Plans

Generally, annual contributions are made at such times and in amounts as required by law and may, from time to time, exceed minimum funding requirements. The Retired Officers’ Bonus Plan and the Retired Vice-President Bonus Plan are unfunded plans and contributions are made as benefits are paid. As of March 31, 2017 and 2016, there were no plan assets for either the Retired Officers’ Bonus Plan or the Retired Vice-President Bonus Plan and therefore, the accumulated liability of $5.4 million and $4.5 million, respectively, is unfunded. The liability will be distributed in a lump-sum payment as each officer or vice-president retires.

The expected future medical benefit payments and related contributions are as follows:




For the Fiscal Year Ending March 31,
2018	$	3,303
2019	$	3,691
2020	$	4,081
2021	$	4,605
2022	$	5,041
2023 - 2027	$	30,862

Long-term Disability Benefits

The Company offers medical and dental benefits to inactive employees (and their eligible dependents) on long-term disability. These benefits do not vary with an employee's years of service; therefore, the Company is required to accrue the costs of the benefits at the date the inactive employee becomes disability eligible and elects to participate in the benefit. The accrued cost for such benefits is calculated using an actuarial estimate. As discussed in Note 2, the Company identified misstatements associated with these benefits and as result, the effects of the immaterial misstatements have been corrected in the current period. The accrued cost for these benefits was $22.5 million at March 31, 2017 and is presented in other long-term liabilities. The cumulative effect of the changes in the historical actuarial gains and losses, including for fiscal 2017, has been recognized in earnings for $6.9 million and is recorded in general and administrative expenses.

Accumulated Other Comprehensive Loss (Notes)

12 Months Ended

Mar. 31, 2017

Equity [Abstract]

ACCUMULATED OTHER COMPREHENSIVE LOSS

All amounts recorded in other comprehensive loss are related to the Company's post-retirement plan. The following table represents a roll-forward of amounts recognized in accumulated other comprehensive loss, net of tax:



	March 31,
	2017			2016			2015
Beginning of year	$	(19,613	)	$	(22,159	)	$	(6,636	)
Other comprehensive income (loss) before reclassifications	688			404			(15,873		)
Amounts reclassified from accumulated other comprehensive loss	1,848			2,142			350
Net current-period other comprehensive income (loss)	2,536			2,546			(15,523		)
End of year	$	(17,077	)	$	(19,613	)	$	(22,159	)

The following table presents the reclassifications out of accumulated other comprehensive loss to net income:



	March 31,
	2017			2016			2015
Amortization of net actuarial loss included in net periodic benefit cost (See Note 13)
Total before tax	$	3,050		$	3,536		$	577
Tax benefit	(1,202		)	(1,394		)	(227		)
Net of tax	$	1,848		$	2,142		$	350

- Definition

The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e689-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669619-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 12
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
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-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Reclassification Adjustments
-URI http://asc.fasb.org/extlink&oid=6522872

+ Details

Other Long-Term Liabilities

12 Months Ended

Mar. 31, 2017

Other Liabilities Disclosure [Abstract]

OTHER LONG-TERM LIABILITIES

Other long-term liabilities consisted of the following:



	March 31,
	2017		2016
Deferred rent	$	63,854	$	53,170
Postretirement benefit obligations	123,492		118,554
Other (1)	28,946		4,081
Total other long-term liabilities	$	216,292	$	175,805

(1) Balance at March 31, 2017 includes a long-term disability obligation as discussed in Note 13 for $22.5 million and contingent consideration of $3.6 million as discussed in Note 4.

Stockholders' Equity

12 Months Ended

Mar. 31, 2017

Equity [Abstract]

STOCKHOLDERS' EQUITY

STOCKHOLDERS’ EQUITY

Common Stock

Holders of Class A Common Stock, Class C Restricted Common Stock, and Class E Special Voting Common Stock are entitled to one vote for each share as a holder. The holders of the Voting Common Stock shall vote together as a single class. The holders of Class B Non-Voting Common Stock have no voting rights.

Class C Restricted Common Stock was restricted in that a holder’s shares vested as set forth in the Rollover Plan. Refer to Note 17 for further discussion of the Rollover Plan.

When shares of Class B Non-Voting Common Stock or Class C Restricted Common Stock are sold on the open market, they become Class A Common Stock shares. At the annual meeting of stockholders held on July 31, 2014, the stockholders approved a proposal to amend and restate the certificate of incorporation, which had the effect of converting all issued and outstanding shares of Class B Non-Voting Common Stock and Class C Restricted Common Stock into shares of Class A Common Stock on a one-for-one basis. The conversion was effected on August 13, 2014 when the Company filed its third amended and restated certificate of incorporation with the Secretary of State of the State of Delaware. As a result of the conversion, there were no shares of Class B Non-Voting Common Stock and Class C Restricted Common Stock outstanding at such time.

Class E Special Voting Common Stock represents the voting rights that accompany the Rollover Options. Rollover Options have a fixed vesting and exercise schedule to comply with IRS Section 409A. Upon exercise, the option will convert to Class A Common Stock, and the corresponding Class E Special Voting Common Stock will be repurchased by the Company and retired. On September 30, 2015, the Company purchased, at par value, all issued and outstanding shares of Class E special voting common stock in connection with the exercise of the final tranche of rollover options during the second quarter of fiscal 2016. Refer to Note 17 for further discussion of the Rollover Options.

Each share of common stock, except for Class E Special Voting Common Stock, is entitled to participate equally in dividends, when and if declared by the Board of Directors from time to time, such dividends and other distributions in cash, stock, or property from the Company’s assets or funds become legally available for such purposes subject to any dividend preferences that may be attributable to preferred stock that may be authorized. The Company’s ability to pay dividends to stockholders is limited as a practical matter by restrictions in the credit agreements governing the Senior Credit Facilities.

The authorized and unissued Class A Common Stock shares are available for future issuance upon share option exercises, without additional stockholder approval.

Employee Stock Purchase Plan

In connection with the Company’s initial public offering in November 2010, the Company established a tax qualified Employee Stock Purchase Plan, or ESPP, which is designed to enable eligible employees to periodically purchase shares of the Company’s Class A Common Stock up to an aggregate of 10,000,000 shares at a five percent discount from the fair market value of the Company’s common stock. The ESPP provides for quarterly offering periods, the first of which commenced on April 1, 2011. For the year ended March 31, 2017, 201,558 Class A Common Stock shares were purchased by employees under the ESPP. Since the program's inception, 1,934,907 shares have been purchased by employees.

Share Repurchase Program

On December 12, 2011, the Board of Directors approved a $30.0 million share repurchase program, to be funded from cash on hand. A special committee of the Board of Directors was appointed to evaluate market conditions and other relevant factors and initiate repurchases under the program from time to time. On January 27, 2015, the Board of Directors approved an increase to the share repurchase authorization to $180.0 million. On January 25, 2017, the Board of Directors approved an increase to the share repurchase authorization from $180.0 million to up to $410.0 million The share repurchase program may be suspended, modified or discontinued at any time at the Company’s discretion without prior notice. On November 5, 2014, the Company entered into an agreement with an affiliate of The Carlyle Group to repurchase 1,000,000 shares of our Class A common stock pursuant to the repurchase program. The shares were repurchased at a price of $25.10 per share as part of a private non-underwritten transaction. On February 2, 2015, the Company entered into a similar agreement with an affiliate of the Carlyle Group to repurchase an additional 1,000,000 shares of our Class A common stock pursuant to the repurchase program. The shares were repurchased from the Underwriter at a price of $28.36 per share. During fiscal 2016, the Company purchased 2,100,000 shares of the Company’s Class A Common Stock in a series of open market transactions for $54.9 million. During fiscal 2017, the Company purchased 1,306,388 shares of the Company’s Class A Common Stock in a series of open market transactions for $46.4 million. As of March 31, 2017, the Company had $255.3 million remaining under the repurchase program.

Dividends

The following table summarizes the cash distributions recognized in the consolidated statement of cash flows:



	Fiscal Year Ended March 31,
	2017		2016		2015
Recurring dividends (1)	$	92,925	$	80,015	$	67,846
Special dividends (2)	—		—		147,248
Dividend equivalents (3)	2,254		31,802		47,110
Total distributions	$	95,179	$	111,817	$	262,204

(1) Amounts represent recurring quarterly dividends that were declared and paid for during each quarter of fiscal 2017, 2016, and 2015.

(2) Amount represents aggregate special dividends of $1.00 per share ($1.00 paid on August 29, 2014) that were declared and paid for during fiscal 2015.

(3) Dividend equivalents are distributions made to option holders equal to the special dividends declared and paid.

For each special dividend authorized and declared, the Board of Directors, acting as the Administrator of the Officers' Rollover Stock Plan and the Amended and Restated Equity Incentive Plan, or EIP, is required to make a determination under the respective plan's antidilution provision to adjust the outstanding options. Refer to Note 17 for further discussion of the special dividends.

The total payout of the dividend and the dividend equivalents have been presented as a financing activity within the consolidated statement of cash flows.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

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+ Details

Stock-Based Compensation

12 Months Ended

Mar. 31, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

STOCK-BASED COMPENSATION

The following table summarizes stock-based compensation expense recognized in the consolidated statements of operations:



	Fiscal Year Ended March 31,
	2017		2016		2015
Cost of revenue	$	5,756	$	7,001	$	8,652
General and administrative expenses	15,493		17,991		17,511
Total	$	21,249	$	24,992	$	26,163

The following table summarizes the total stock-based compensation expense recognized in the consolidated statements of operations by the following types of equity awards:



	Fiscal Year Ended March 31,
	2017		2016		2015
Equity Incentive Plan Options	$	2,523	$	3,702	$	4,897
Class A Restricted Common Stock	18,726		21,290		21,266
Total	$	21,249	$	24,992	$	26,163

As of March 31, 2017 and 2016, there was $12.8 million and $20.3 million, respectively, of total unrecognized compensation cost related to unvested stock-based compensation agreements. The unrecognized compensation cost as of March 31, 2017 is expected to be fully amortized over the next 5 years. Absent the effect of accelerating stock compensation cost for any departures of employees who may continue to vest in their equity awards, the following tables summarize the unrecognized compensation cost, the weighted average period the cost is expected to be amortized, and the estimated annual compensation cost for the future periods indicated below (excludes any future awards):



	Unrecognized Compensation Cost				Weighted Average Remaining Period to be Recognized
	March 31, 2017		March 31, 2016		March 31, 2017	March 31, 2016
Equity Incentive Plan Options	$	1,777	$	4,324	2.84	2.77
Class A Restricted Common Stock	11,007		15,951		1.75	2.02
Total	$	12,784	$	20,275



	Total Unrecognized Compensation Cost
	Total		2018		2019		2020		2021		2022
Equity Incentive Plan Options	$	1,777	$	1,050	$	497	$	197	$	31	$	2
Class A Restricted Common Stock	11,007		8,542		2,183		282		—		—
Total	$	12,784	$	9,592	$	2,680	$	479	$	31	$	2

Equity Incentive Plan

The EIP was created in connection with the Merger Agreement for employees and directors of Holding. The Company created a pool of options, or EIP Options, to draw upon for future grants that would be governed by the EIP. All options under the EIP are exercisable, upon vesting, for shares of Class A common stock of Holding.

Stock options are granted at the discretion of the Board of Directors or its Compensation Committee and expire ten years from the grant date. Options generally vest over a five-year period based upon required service and performance conditions. Starting on February 1, 2012, the Board of Directors or its Compensation Committee updated vesting conditions for stock options, whereby stock options only vest upon a required service condition. The Company calculates the pool of additional paid-in capital associated with excess tax benefits using the “simplified method.”

On October 26, 2016, 43,086 options were granted under the EIP. The estimated fair value of the per-option grant was $6.96, resulting in a total fair value of $0.3 million.

On January 25, 2017, 5,812 options were granted under the EIP. The estimated fair value of the per-option grant was $8.60, resulting in a total fair value of $0.1 million.

The aggregate grant date fair value of the EIP Options issued during fiscal 2017 and 2016, was $0.4 million and $3.4 million respectively, and is being recorded as expense over the vesting period. The total fair value of EIP Options vested during fiscal 2017 and 2016 was $11.8 million and $14.9 million, respectively. The total intrinsic value of EIP options exercised during fiscal 2017 and 2016 was $49.0 million and $16.1 million, respectively. As of March 31, 2017 and 2016, there were 12,026,970 and 12,147,850 options, respectively, available for future grant under the EIP.

In addition to options, the Board of Directors also grants restricted stock awards to members of the Board as compensation for services rendered to the Company. These awards generally vest over one year.

During fiscal 2017, the Company also issued several equity awards in the form of restricted stock to certain newly hired and existing employees and officers of the Company. These awards will vest over a three year period subject to the employees' continued employment with the Company.

Adoption of Annual Incentive Plan

On October 1, 2010, the Board of Directors adopted a new compensation plan in connection with the initial public offering to more appropriately align the Company’s compensation programs with those of similarly situated companies. The amount of the annual incentive payment will be determined based on performance targets established by the Board of Directors and a portion of the bonus may be paid in the form of equity (including stock and other awards under the EIP). If the Board of Directors elects to make payments in equity, the value of the overall award will be increased by 20%, related to the portion paid in equity. Equity awards vest based on the passage of time, subject to the officer’s continued employment by the Company. The portion to be paid in the form of equity will be recognized in the accompanying consolidated statements of operations based on grant date fair value over the vesting period of three years. The portion to be paid in cash is accrued ratably during the fiscal year in which the employees provide service and paid out during the first quarter of the subsequent fiscal year.

Grants of Class A Restricted Common Stock and Restricted Stock Units

During fiscal 2017, the Board of Directors granted an aggregate of 433,218 Class A Restricted Stock Units and 40,029 shares of Class A Restricted Common Stock to newly promoted and hired partners and vice presidents, existing employees, and members of the Board of Directors. The aggregate value of these awards approximated $14.1 million and were based on the grant date stock price, which ranged from $28.94 to $35.83. The majority of these awards were issued in conjunction with the Annual Incentive Plan, whereby the amount of the annual incentive payment is determined based on performance targets established by the Compensation Committee and a portion of the incentive payment is paid in the form of Restricted Stock Units. A Restricted Stock Unit represents a contingent right to receive one share of Class A Common Stock upon vesting. The Restricted Stock Units will vest over a period of three years, subject to the participant's continued employment with the Company.

The total fair value of restricted stock shares vested during fiscal 2017 and 2016 was $30.2 million and $26.5 million, respectively.

Officers’ Rollover Stock Plan

The Rollover Plan was adopted as a mechanism to enable Company officers to exchange a portion of their previous equity interests in the pre-acquisition Company for equity interests in the Company. Unvested stock rights that would have vested in 2008 were exchanged for 2,028,270 shares of new Class C Restricted Stock issued by the Company. For the fiscal years ended March 31, 2016 and March 31, 2017 all shares of Class C Restricted Stock were fully vested. At March 31, 2017 and 2016, 3,971,730 shares of Class C Restricted Stock were authorized but unissued under the Plan.

As permitted under the terms of the EIP, the Compensation Committee, as Administrator of the Plan, authorized the withholding of taxes not to exceed the minimum statutory withholding amount, through the surrender of shares of Class A common stock issuable upon the vesting or accelerated vesting of Restricted Stock. For those holders who elected to participate, the trade dates were as listed in the table below. As a result of these transactions, the Company repurchased a total of 308,793 shares and recorded them as treasury shares at a cost of $10.0 million, detailed as follows:



Total Shares Withheld to Cover Taxes
Trade Date	Shares	Cost	Total
April 1, 2016	19	$30.55	$	580
April 11, 2016	9	$29.29	264
April 18, 2016	1	$28.37	28
June 30, 2016	154,012	$29.64	4,564,916
July 11, 2016	6	$30.18	181
December 6, 2016	10	$37.96	380
March 31, 2017	154,736	$35.39	5,476,107
Total	308,793		$	10,042,456

Methodology

The Company uses the Black-Scholes option-pricing model to determine the estimated fair value for stock-based awards. The fair value of the Company’s stock is based on the closing price on the New York Stock Exchange.

During fiscal 2017, the Company’s Board of Directors authorized and declared three regular quarterly cash dividends of $0.15 per share and one quarterly cash dividend of $0.17 per share. Therefore, an annualized dividend yield between 1.90% and 1.94% was used in the Black-Scholes option-pricing model for all grants issued during the fiscal year. The Company plans to continue paying recurring dividends in the near term and assessing its excess cash resources to determine the best way to utilize its excess cash flow to meet its objectives. One way the Company may utilize excess cash includes the payment of special dividends. The Company does not anticipate or forecast the payment of special dividends and therefore does not include special dividends in the annual dividend yield that the company uses to calculate the fair value of stock options, as the Company does not pay these special dividends on a regular basis.

Implied volatility is calculated as of each grant date based on our historical volatility. Other than the expected life of the option, volatility is the most sensitive input to our option grants.

The risk-free interest rate is determined by reference to the U.S. Treasury yield curve rates with the remaining term equal to the expected life assumed at the date of grant. The average expected life is calculated based on the Company's historical experience with respect to its stock plan activity in combination with an estimate of when vested and unexercised option shares will be exercised. Forfeitures were estimated based on the Company’s historical analysis of officer and vice-president attrition levels and actual forfeiture rates by grant date.

The weighted average assumptions used in the Black-Scholes option-pricing model for stock option awards were as follows:



	For The Fiscal Year Ended March 31,
	2017	2016	2015
Dividend yield	1.94%	1.83%	1.90%
Expected volatility	29.65%	29.85%	30.42%
Risk-free interest rate	1.38%	1.33%	1.60%
Expected life (in years)	5.00	5.08	5.00
Weighted-average grant date fair value	$7.16	$6.67	$5.55

Special Dividends

The Compensation Committee, acting as the Administrator of the EIP, has discretion in how to effect the required adjustment to keep option holders whole in the event of a distribution of dividends that trigger certain anti-dilution clauses within the respective plans. In the event the Compensation Committee elects to grant option holders a cash payment equal to the amount of the special dividend, the Company accrues a stock-based compensation liability as the EIP options are scheduled to be vested. The obligation will be settled on the later of the date the dividend is paid or the vesting date of the EIP options. The stock-based compensation liability includes all special dividends declared for which eligible EIP option holders have not yet received a distribution.

On July 30, 2014, the Board of Directors authorized and declared a special cash dividend of $1.00 per share. The dividend was paid on August 29, 2014 to stockholders of record on August 11, 2014. For each special dividend declared, the Compensation Committee, acting as the Administrator of the Officers' Rollover Stock Plan and the EIP, made a determination to adjust outstanding Rollover and EIP options for the special dividend to prevent the dilution of the benefit or potential benefit of the options. The adjustment was in the form of a $1.00 dividend equivalent. Holders of EIP options will receive a cash payment equal to the amount of the special dividend payable on the date the dividend was paid or the vesting of the EIP option, whichever is later.

On June 30, 2016, vested EIP option holders received a payment of $2.2 million related to the special dividends declared in fiscal years 2013, 2014, and 2015. On March 31, 2017, vested EIP option holders received a payment of $0.1 million related to the special dividends declared in fiscal years 2014 and 2015. Payment of the dividend equivalents were accounted for as modifications resulting in incremental benefit to the option holders resulting in additional compensation expense. Total compensation expense recorded in conjunction with the payment of all dividend equivalents to holders of unvested EIP options for the fiscal year ended March 31, 2017 was $0.2 million. Future compensation cost related to payment of the dividend equivalents to holders of EIP options not yet recognized in the statement of operations is $0.03 million and is expected to be recognized over 0.25 years.

As of March 31, 2017 and 2016, the Company calculated a total recorded and unrecorded stock-based compensation liability of $1.3 million and $3.8 million, respectively, related to the special dividends paid in June 2012, November 2013, and February and August 2014, with $1.0 million and $2.3 million recorded as a current liability as of March 31, 2017 and 2016, respectively.

As of March 31, 2017, $0.4 million related to EIP Options will be recorded as liabilities as the options vest over the next two years. As of March 31, 2016, there was an unrecorded liability of $1.5 million related to EIP options.

The following table summarizes unvested restricted stock activity for the periods presented:



	Number of Shares	Weighted Average Grant Date Fair Value

Unvested Restricted Stock Awards
Unvested at March 31, 2016	1,759,952	23.00
Granted	473,247	29.69
Vested	946,393	22.63
Forfeited	9,298	28.98
Unvested at March 31, 2017	1,277,508	25.71

The following table summarizes stock option activity for the periods presented:



	Number of Options	Weighted Average Exercise Price
Equity Incentive Plan Options
Options outstanding at March 31, 2016	5,793,008	$	11.82	*
Granted	48,898	31.57
Forfeited	82,422	20.85
Expired	3,752	27.16
Exercised	1,931,495	7.60
Options outstanding at March 31, 2017	3,824,237	$	13.99	*

* Reflects exercise price adjustment of $6.36 per grant for the $6.50 dividend per share issued July 30, 2012.

The following table summarizes unvested stock options for the periods presented:



	Number of Options	Weighted Average Grant Date Fair Value
Equity Incentive Plan Options
Unvested at March 31, 2016	1,565,841	$	5.73
Granted	48,898	7.16
Vested	719,756	6.02
Forfeited	82,422	5.33
Unvested at March 31, 2017	812,561	$	5.61

The following table summarizes stock options outstanding at March 31, 2017:



Range of exercise prices	Stock Options Outstanding	Weighted Average Exercise Price		Weighted Average Remaining Contractual Life	Intrinsic Value		Stock Options Exercisable	Weighted Average Exercise Price	Weighted Average Remaining Contractual Life	Intrinsic Value
				(In years)					(In years)
Equity Incentive Plan
$4.28 - $35.83	3,824,237	$13.99	(1)	4.78	$	81,817	3,011,676	$11.79	4.18	$71,073

(1) Reflects exercise price adjustment of $6.36 per grant for the $6.50 dividend per share issued July 30, 2012.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References + Details

Fair Value Measurements

12 Months Ended

Mar. 31, 2017

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

The accounting standard for fair value measurements establishes a three-tier value hierarchy, which prioritizes the inputs used in measuring fair value as follows: observable inputs such as quoted prices in active markets (Level 1); inputs other than quoted prices in active markets that are observable either directly or indirectly (Level 2); and unobservable inputs in which there is little or no market data, which requires the Company to develop its own assumptions (Level 3).

A financial instrument's level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. The financial instruments measured at fair value in the accompanying consolidated balance sheets consist of the following:



	Recurring Fair Value Measurements as of March 31, 2017
	Level 1		Level 2		Level 3		Total
Cash and cash equivalents:
Cash and cash equivalents	$	59,825	$	—	$	—	$	59,825
Money market funds (1)	—		157,592		—		157,592
Total cash and cash equivalents	$	59,825	$	157,592	$	—	$	217,417
Liabilities:
Contingent consideration liability (2)	—		—		3,576		3,576
Total liabilities	$	—	$	—	$	3,576	$	3,576



	Recurring Fair Value Measurements as of March 31, 2016
	Level 1		Level 2		Level 3		Total
Cash and cash equivalents:
Cash and cash equivalents	$	42,102	$	—	$	—	$	42,102
Money market funds (1)	—		145,427		—		145,427
Total cash and cash equivalents	$	42,102	$	145,427	$	—	$	187,529

(1) Level 2 cash and cash equivalents are invested in money market funds that are intended to maintain a stable net asset value of $1.00 per share by investing in liquid, high quality U.S. dollar-denominated money market instruments. Therefore, the fair value approximates the carrying value. Depending on our short-term liquidity needs, we make regular transfers between money market funds and other cash equivalents.

(2) As discussed in Note 4, the Company recognized a contingent consideration liability in connection with the acquisition of Aquilent. As of March 31, 2017, the estimated fair value of the contingent consideration liability was $3.6 million and was valued using probability-weighted cash flows, which is based on the use of Level 3 fair value measurement inputs. The liability is recorded in other long-term liabilities in the consolidated balance sheet.

The fair value of the Company's debt instruments approximated its carrying value at March 31, 2017 and March 31, 2016. The fair value of debt is determined using quoted prices or other market information obtained from recent trading activity of each debt tranche in markets that are not active (Level 2 inputs). The fair value is corroborated by prices derived from the interest rate spreads of recently completed leveraged loan transactions of a similar credit profile, industry, and terms to that of the Company.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Related-Party Transactions	12 Months Ended
Related-Party Transactions	Mar. 31, 2017
Related Party Transactions [Abstract]
RELATED-PARTY TRANSACTIONS	RELATED-PARTY TRANSACTIONS In March 2017, the Company supported the formation of the Booz Allen Foundation, a nonprofit corporation organized and operated exclusively for charitable, scientific and educational purposes within the meaning of Section 501(c)(3) of the Internal Revenue Code of 1986, as amended. The Company is the sole member of the foundation, which gives it the authority to appoint two out of five of the Booz Allen Foundation’s directors and consent rights regarding certain extraordinary corporate actions approved by the board of directors. The Company has made a binding and irrevocable pledge of $5.0 million to the Booz Allen Foundation. The pledge expense is presented in other income (expenses), net and the pledge obligation is presented in other current liabilities on the consolidated balance sheet of the Company. During the third quarter of fiscal 2017, The Carlyle Group, or Carlyle, sold its remaining shares of Class A common stock of the Company in an underwritten transaction. As of March 31, 2017, Carlyle does not beneficially own any shares of Class A common stock of the Company. Prior to this transaction, Carlyle was the largest shareholder of the Company. From time to time, and in the ordinary course of business: (1) other Carlyle portfolio companies engage the Company as a subcontractor or service provider, and (2) the Company engages other Carlyle portfolio companies as subcontractors or service providers. Revenue and cost associated with these related parties for fiscal 2017, 2016, and 2015 were not material. On July 31, 2008, the Company entered into a management agreement, or Management Agreement, with TC Group V US, L.L.C., or TC Group, a company affiliated with Carlyle. On June 7, 2012, TC Group assigned all of its right, title and interest in, and obligations under, the Management Agreement to Carlyle Investment Management L.L.C., or Carlyle Investment Management. In accordance with the Management Agreement, Carlyle Investment Management provided the Company with advisory, consulting and other services and the Company paid Carlyle Investment Management an aggregate annual fee of $1.0 million, plus expenses. For fiscal 2017, 2016, and 2015, the Company incurred $0.8 million, $1.0 million and $1.0 million per year in advisory fees, respectively. The Management Agreement terminated on December 6, 2016, upon the closing of the sale by Carlyle of their remaining shares of Class A common stock of the Company.

Commitments and Contingencies

12 Months Ended

Mar. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

Leases

The Company leases office space under noncancelable operating leases that expire at various dates through 2028. The terms for the facility leases generally provide for rental payments on a graduated scale, which are recognized on a straight-line basis over the terms of the leases, including reasonably assured renewal periods, from the time the Company controls the leased property. Sometimes lease payments include payments for insurance, maintenance, and property taxes. There are no purchase options on operating leases at terms favorable to market rents. Lease incentives are recorded as a deferred credit and recognized as a reduction to rent expense on a straight-line basis over the lease term. Rent expense was approximately $81.6 million, net of $0.5 million of sublease income, $88.5 million, net of $0.5 million of sublease income, and $92.9 million, net of $0.7 million of sublease income, for fiscal 2017, 2016, and 2015, respectively.

Future minimum operating lease payments for noncancelable operating leases and future minimum income for noncancelable sublease rentals are summarized as follows:



For the Fiscal Year Ending March 31,	Operating Lease Payments		Operating Sublease Income
2018	$	70,119	$	386
2019	63,198		184
2020	54,846		54
2021	50,033		41
2022	38,183		20
Thereafter	107,562		—
	$	383,941	$	685

Rent expense is included in occupancy costs, a component of general and administrative expenses, as shown on the consolidated statements of operations, and includes rent, sublease income from third parties, real estate taxes, utilities, parking, security, repairs and maintenance, and storage costs.

Letters of Credit and Third-Party Guarantees

As of March 31, 2017 and 2016, the Company was contingently liable under open standby letters of credit and bank guarantees issued by our banks in favor of third parties that totaled $8.6 million and $6.6 million, respectively. These letters of credit and bank guarantees primarily support insurance and bid and performance obligations. At March 31, 2017 and 2016, approximately $1.7 million and $1.8 million, respectively, of these instruments reduce the available borrowings under the Revolving Credit Facility. The remainder is guaranteed under a separate $10.0 million facility established in fiscal 2015 of which $3.1 million and $5.2 million, respectively, was available to the Company at March 31, 2017 and 2016.

Government Contracting Matters

For fiscal 2017, 2016, and 2015, approximately 97%, 97%, and 98%, respectively, of the Company’s revenue was generated from contracts where the end client was an agency or department of the U.S. government, including contracts where the Company performed in either a prime or subcontract position, and regardless of the geographic location in which the work was performed. Contracts with the U.S. government are subject to extensive legal and regulatory requirements. From time to time and in the ordinary course of business, agencies of the U.S. government audit our contract costs and conduct inquiries and investigations of our business practices with respect to government contracts to determine whether the Company’s operations are conducted in accordance with these requirements and the terms of the relevant contracts. U.S. government agencies, including the Defense Contract Audit Agency, routinely audit our contract costs, including allocated indirect costs for compliance with the Cost Accounting Standards and the Federal Acquisition Regulation. These agencies also conduct reviews and investigations and make inquiries regarding our accounting and other systems in connection with our performance and business practices with respect to our government contracts. U.S. government audits, inquiries, or investigations of the Company, whether related to the Company’s U.S. government contracts or conducted for other reasons, could result in administrative, civil, or criminal liabilities, including withholding of payments, suspension of payments, repayments, fines, or penalties being imposed upon the Company, or could lead to suspension or debarment from future U.S. government contracting. Management believes it has recorded the appropriate provision for any audit, inquiry, or investigation of which it is aware. During fiscal 2017, the Defense Contract Management Agency Administrative Contracting Officer negotiated annual final indirect cost rates for fiscal years 2010 and 2011. As a result, the Company reduced a portion of its provision for the recovery of allowable expenses based on the outcome of these negotiations and the settlement of the final indirect costs for fiscal years 2010 and 2011. The Company also revised its provision based on the outcome of the negotiations and related and new emerging exposures that may result in future cost disallowance, including cost reductions and/or penalties. Management believes it has recorded the appropriate provision for the estimated losses that may be experienced from any such reductions and/or penalties. As of March 31, 2017 and 2016, the Company has recorded a liability of approximately $175.7 million and $189.9 million, respectively, for its current best estimate of amounts to be refunded to customers for potential adjustments from audits or reviews of contract costs incurred subsequent to fiscal year 2011, and for contracts not yet closed that are impacted by settlement of audits or reviews of contract costs incurred in prior fiscal years.

Litigation

The Company is involved in legal proceedings and investigations arising in the ordinary course of business, including those relating to employment matters, relationships with clients and contractors, intellectual property disputes, and other business matters. These legal proceedings seek various remedies, including claims for monetary damages in varying amounts, none of which are considered material, or are unspecified as to amount. Although the outcome of any such matter is inherently uncertain and may be materially adverse, based on current information, management does not expect any of the currently ongoing audits, reviews, investigations, or litigation to have a material adverse effect on the Company’s financial condition and results of operations. As of March 31, 2017 and 2016, there were no material amounts accrued in the consolidated financial statements related to these proceedings.

Six former officers and stockholders who had departed the company prior to the acquisition have filed a total of nine suits in various jurisdictions, with original filing dates ranging from July 3, 2008 through December 15, 2009, against us and certain of our current and former directors and officers. Three of these suits were amended on July 2, 2010 and then further amended into one consolidated complaint on September 7, 2010. Another two of the original nine suits were consolidated into one complaint on September 24, 2014. Each of the suits arises out of the acquisition and alleges that the former stockholders are entitled to certain payments that they would have received if they had held their stock at the time of the acquisition. Some of the suits also allege that the acquisition price paid to stockholders was insufficient. The various suits assert claims for breach of contract, tortious interference with contract, breach of fiduciary duty, civil Racketeer Influenced and Corrupt Organizations Act, or RICO, violations, violations of the Employee Retirement Income Security Act, and/or securities and common law fraud. Three of these suits have been dismissed with all appeals exhausted. The two suits that were consolidated into one action on September 24, 2014 were settled on April 16, 2015. One of the remaining suits has been dismissed by the United States District Court for the Southern District of California and such dismissal was upheld by the United States Court of Appeals for the Ninth Circuit. The plaintiff in this suit subsequently filed a Petition for Writ of Certiorari to the United States Supreme Court, which was denied by the United States Supreme Court on January 9, 2017. The other three remaining suits that were previously consolidated on September 7, 2010 have been dismissed by the United States District Court for the Southern District of New York and are on appeal before the United States Court of Appeals for the Second Circuit. On December 15, 2016, hearings relating to the appeal were held before the United States Court of Appeals for the Second Circuit. As of March 31, 2017, the United States Court of Appeals for the Second Circuit has not ruled on this appeal. As of March 31, 2017, the aggregate alleged damages sought in these three remaining suits was approximately $241.7 million (substantially all of which is sought to be trebled pursuant to RICO), plus punitive damages, costs, and fees. Although the outcome of any of these cases is inherently uncertain and may be materially adverse, based on current information, management does not expect them to have a material adverse effect on our financial condition and results of operations.

Business Segment Information	12 Months Ended
Business Segment Information	Mar. 31, 2017
Segment Reporting [Abstract]
BUSINESS SEGMENT INFORMATION	BUSINESS SEGMENT INFORMATION The Company reports operating results and financial data in one operating and reportable segment. The Company manages its business as a single profit center in order to promote collaboration, provide comprehensive functional service offerings across its entire client base, and provide incentives to employees based on the success of the organization as a whole. Although certain information regarding served markets and functional capabilities is discussed for purposes of promoting an understanding of the Company’s complex business, the Company manages its business and allocates resources at the consolidated level of a single operating segment.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

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+ Details

Unaudited Quarterly Financial Data

12 Months Ended

Mar. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

UNAUDITED QUARTERLY FINANCIAL DATA



	2017 Quarters
	First		Second		Third		Fourth
Revenue	$	1,422,722	$	1,394,853	$	1,404,638	$	1,582,071
Operating income	129,301		117,661		108,124		129,161
Income before income taxes	113,364		97,747		92,615		108,174
Net income	67,817		62,830		55,590		66,253
Earnings per common share:
Basic (1)	$	0.46	$	0.42	$	0.37	$	0.44
Diluted (1)	$	0.45	$	0.41	$	0.37	$	0.44



	2016 Quarters
	First		Second		Third		Fourth
Revenue	$	1,351,604	$	1,322,154	$	1,307,663	$	1,424,317
Operating income	126,144		108,816		105,116		104,508
Income before income taxes	108,586		90,953		87,909		92,014
Net income	64,306		56,216		108,055		65,517
Earnings per common share:
Basic (1)	$	0.44	$	0.38	$	0.72	$	0.44
Diluted (1)	$	0.43	$	0.37	$	0.71	$	0.43

(1) Earnings per share are computed independently for each of the quarters presented and therefore may not sum to the total for the fiscal year.

Supplemental Financial Information

12 Months Ended

Mar. 31, 2017

Valuation and Qualifying Accounts [Abstract]

SUPPLEMENTAL FINANCIAL INFORMATION

The following schedule summarizes valuation and qualifying accounts for the periods presented:



	Fiscal Year Ended March 31,
	2017			2016			2015
Allowance for doubtful accounts:
Beginning balance	$	656		$	357		$	1,457
Provision for doubtful accounts	(135		)	352			(1,100		)
Charges against allowance	(521		)	(53		)	—
Ending balance	$	—		$	656		$	357

Subsequent Events	12 Months Ended
Subsequent Events	Mar. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS Interest Rate Swaps On April 6, 2017, Booz Allen Hamilton entered into three interest rate swap agreements with three different financial institutions to fix the LIBOR portion of the interest rate on outstanding debt under the Credit Agreement, as amended. Each swap has a notional amount of $100 million and fixes LIBOR at 1.998% with an effective date of April 30, 2018 and a maturity date of June 30, 2021. Senior Notes Offering On April 25, 2017, Booz Allen Hamilton issued $350 million aggregate principal amount of its 5.125% Senior Notes due 2025 under an Indenture, dated as of April 25, 2017, among Booz Allen Hamilton, certain subsidiaries of Booz Allen Hamilton, as guarantors (the “Subsidiary Guarantors”), and Wilmington Trust, National Association, as trustee (the “Trustee”), as supplemented by the First Supplemental Indenture, dated as of April 25, 2017, among Booz Allen Hamilton, the Subsidiary Guarantors and the Trustee. The proceeds from the sale have been used to repay all outstanding loans under the Revolving Credit Facility. Share Re-purchase Program The Company paid $9.9 million during the first quarter of fiscal 2018 for 279,600 shares repurchased during the fourth quarter of fiscal 2017 that had not settled in cash by March 31, 2017. Dividend Declared On May 22, 2017, the Company announced that its Board of Directors had declared a quarterly cash dividend of $0.17 per share. Payment of the dividend will be made on June 30, 2017 to stockholders of record at the close of business on June 10, 2017.

Summary of Significant Accounting Policies (Policies)	12 Months Ended
Summary of Significant Accounting Policies (Policies)	Mar. 31, 2017
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries, and have been prepared in accordance with accounting principles generally accepted in the United States, or U.S. GAAP, and the rules and regulations of the U.S. Securities and Exchange Commission, or SEC. All intercompany balances and transactions have been eliminated in consolidation. The consolidated financial statements and notes of the Company include its subsidiaries, and the joint ventures and partnerships over which the Company has a controlling financial interest. The Company uses the equity method to account for investments in entities that it does not control if it is otherwise able to exert significant influence over the entities' operating and financial policies. The Company’s fiscal year ends on March 31 and unless otherwise noted, references to fiscal year or fiscal are for fiscal years ended March 31. The accompanying consolidated financial statements present the financial position of the Company as of March 31, 2017 and 2016 and the Company’s results of operations for fiscal 2017, fiscal 2016, and fiscal 2015. Certain amounts reported in the Company's prior year consolidated financial statements have been reclassified to conform to the current year presentation.
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements, and the reported amounts of revenue and expenses during the reporting periods. Areas of the consolidated financial statements where estimates may have the most significant effect include contractual and regulatory reserves, valuation and lives of tangible and intangible assets, contingent consideration related to business acquisitions, impairment of long-lived assets, accrued liabilities, revenue recognition and costs to complete fixed-price contracts, bonus and other incentive compensation, stock-based compensation, reserves for tax benefits and valuation allowances on deferred tax assets, provisions for income taxes, postretirement obligations, certain deferred costs, collectability of receivables, and loss accruals for litigation. Actual results experienced by the Company may differ materially from management's estimates.
Revenue Recognition	Revenue Recognition Substantially all of the Company’s revenue is derived from services and solutions provided to the U.S. government and its agencies, primarily by the Company’s consulting staff and, to a lesser extent, subcontractors. The Company generates its revenue from the following types of contractual arrangements: cost-reimbursable-plus-fee contracts, time-and-materials contracts, and fixed-price contracts. Revenue on cost-reimbursable-plus-fee contracts is recognized as services are performed, generally based on the allowable costs incurred during the period plus any recognizable earned fee. The Company considers fixed fees under cost-reimbursable-plus-fee contracts to be earned in proportion to the allowable costs incurred in performance of the contract. For cost-reimbursable-plus-fee contracts that include performance-based fee incentives, which are principally award fee arrangements, the Company recognizes income when such fees are probable and estimable. Estimates of the total fee to be earned are made based on contract provisions, prior experience with similar contracts or clients, and management’s evaluation of the performance on such contracts. Revisions to these estimates may result in increases or decreases to revenue and income, and are reflected in the consolidated financial statements in periods in which they are identified. Historically, revisions to these estimates have not had a material effect on our results of operations. Contract costs, including indirect expenses, are subject to audit by the Defense Contract Audit Agency, or DCAA, and, accordingly, are subject to possible cost disallowances. Executive compensation that we determine to be allowable for cost reimbursement based on management's estimates is recognized as revenue, net of reserves. Management's estimates in this regard are based on a number of factors that may change over time, including executive compensation survey data, our and other government contractors' experiences with the DCAA audit practices in our industry, and relevant decisions of courts and boards of contract appeals. Revenue earned under time-and-materials contracts is recognized as hours are worked based on contractually billable rates to the client. Costs on time-and-materials contracts are expensed as incurred. Revenue on fixed-price contracts is primarily recognized using the percentage of completion method based on actual costs incurred relative to total estimated costs for the contract. On some fixed-price contracts the Company may use an alternative input method to calculate the percent complete, such as labor hours or labor dollars. This method is used when a contract contains significant, up-front material purchases resulting in costs incurred that are not representative of the actual progress on the contract. In either method, these estimated costs are updated during the term of the contract, and may result in revision by the Company of recognized revenue and estimated costs in the period in which the changes in estimated costs are identified. Historically, revisions to these estimates have not had a material effect on our results of operations. Profits on fixed-price contracts result from the difference between incurred costs used to calculate the percentage of completion and revenue earned. Contract accounting requires significant judgment relative to assessing risks, estimating contract revenue and costs, and making assumptions for schedule and technical issues. Due to the size and nature of many of the Company’s contracts, developing total revenue and cost at completion estimates requires the use of significant judgment. Contract costs include direct labor and billable expenses and an allocation of allowable indirect costs. Billable expenses is comprised of subcontracting costs and other “out of pocket” costs that often include, but are not limited to, travel-related costs and telecommunications charges. The Company typically recognizes revenue and billable expenses from these transactions on a gross basis when it is the primary obligor on our contracts with customers. Assumptions regarding the length of time to complete the contract also include expected increases in wages and prices for materials. Estimates of total contract revenue and costs are monitored during the term of the contract and are subject to revision as the contract progresses. Anticipated losses on contracts are recognized in the period they are deemed probable and can be reasonably estimated. The Company’s contracts may include the delivery of a combination of one or more of the Company’s service offerings. In these situations, the Company determines whether such arrangements with multiple service offerings should be treated as separate units of accounting based on how the elements are bid or negotiated, whether the customer can accept separate elements of the arrangement, and the relationship between the pricing on the elements individually and combined. All other revenues are recognized when persuasive evidence of an arrangement exists, services or products have been provided to the customer, the sales price is fixed or determinable and collectability is reasonably assured.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents include operating cash on hand and highly liquid investments having a weighted average maturity of 60 days or less and a weighted average life of 120 days or less. The Company’s cash equivalents consist primarily of institutional and government money market funds. The Company maintains its cash and cash equivalents in bank accounts that, at times, exceed the federally insured FDIC limits. The Company has not experienced any losses in such accounts.
Valuation of Accounts Receivable	Valuation of Accounts Receivable The Company maintains allowances for doubtful accounts against certain billed and unbilled receivables based upon the latest information regarding whether specific charges are recoverable or invoices are ultimately collectible. Assessing the recoverability of charges and collectability of customer receivables requires management judgment. The Company determines its allowance for doubtful accounts by specifically analyzing individual accounts receivable, historical bad debts, customer credit-worthiness, current economic conditions, accounts receivable aging trends for billed receivables, availability of funding, compliance with contractual terms and conditions, client satisfaction with work performed, and other factors impacting unbilled receivables. Valuation reserves are periodically re-evaluated and adjusted as more information about the ultimate recoverability and collectability of accounts receivable becomes available. Upon determination that a receivable is uncollectible, the receivable balance and any associated reserve are written off.
Concentrations of Credit Risk	Concentrations of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash equivalents and accounts receivable. The Company’s cash equivalents are generally invested in prime or U.S. government money market funds. The Company believes that credit risk for accounts receivable is limited as the receivables are primarily with the U.S. government.
Property and Equipment	Property and Equipment Property and equipment are recorded at cost, and the balances are presented net of accumulated depreciation. The cost of software purchased or internally developed is capitalized, as appropriate. Depreciation is calculated using the straight-line method over the estimated useful lives of the assets. Furniture and equipment is depreciated over five to ten years, computer equipment is depreciated over four years, and software purchased or developed for internal use is depreciated over three to five years. Leasehold improvements are amortized over the shorter of the useful life of the asset or the lease term. Maintenance and repairs are charged to expense as incurred. Rent expense is recorded on a straight-line basis over the life of the respective lease. The difference between the cash payment and rent expense is recorded as deferred rent in either accounts payable and other accrued expenses or other long-term liabilities in the consolidated balance sheets, depending on when the amounts will be recognized. The Company receives incentives for tenant improvements on certain of its leases. The cash expended on such improvements is recorded as property and equipment and amortized over the life of the associated asset, or lease term, whichever is shorter. Incentives for tenant improvements are recorded as deferred rent in either accounts payable and other accrued expenses or other long-term liabilities in the consolidated balance sheets depending on when the amounts will be recognized. Incentives for tenant improvements are amortized on a straight-line basis over the lease term.
Business Combinations	Business Combinations The accounting for the Company’s business combinations consists of allocating the purchase price to tangible and intangible assets acquired and liabilities assumed based on their estimated fair values, with the excess recorded as goodwill. The Company has up to one year from the acquisition date to use information as of each acquisition date to adjust the fair value of the acquired assets and liabilities which may result in material changes to their recorded values with an offsetting adjustment to goodwill.
Intangible Assets	Intangible Assets Intangible assets primarily consist of the Company's trade name, customer relationships, and other amortizable intangible assets. Customer relationships are amortized on an accelerated basis over the expected life based on projected future cash flows of approximately seven to twelve years. The Company's trade name is not amortized, but is tested for impairment on at least an annual basis as of January 1 and more frequently if interim indicators of impairment exist. The trade name is considered to be impaired if the carrying value exceeds its estimated fair value. The Company used the relief from royalty method to estimate the fair value. The fair value of the asset is the present value of the license fees avoided by owning the asset, or the royalty savings. During the fiscal year ended March 31, 2017, the Company recorded impairment charges related to intangible assets acquired in an acquisition. During the fiscal year ended March 31, 2016, and 2015, the Company did not record any impairment of intangible assets.
Goodwill	Goodwill The Company assesses goodwill for impairment on at least an annual basis on January 1 unless interim indicators of impairment exist. Goodwill is considered to be impaired when the net book value of a reporting unit exceeds its estimated fair value. The Company operates as a single operating segment and as a single reporting unit for the purpose of evaluating goodwill. As of January 1, 2017, the Company performed its annual impairment test of goodwill by comparing the fair value of the Company (based on market capitalization) to the carrying value of the Company's net equity, and concluded that the fair value of the reporting unit was significantly greater than the carrying amount. During the fiscal years ended March 31, 2017, 2016, and 2015, the Company did not record any impairment of goodwill.
Long-Lived Assets	Long-Lived Assets The Company reviews its long-lived assets, including property and equipment and amortizable intangible assets, for impairment whenever events or changes in circumstances indicate that the carrying amounts of the assets may not be fully recoverable. If the total of the expected undiscounted future net cash flows is less than the carrying amount of the asset, a loss is recognized for any excess of the carrying amount over the fair value of the asset. During the fiscal years ended March 31, 2017, 2016, and 2015, the Company did not record any impairment charges.
Income Taxes	Income Taxes The Company provides for income taxes as a “C” corporation on income earned from operations. The Company is subject to federal, state, and foreign taxation in various jurisdictions. Deferred tax assets and liabilities are recorded to recognize the expected future tax benefits or costs of events that have been, or will be, reported in different years for financial statement purposes than for tax purposes. Deferred tax assets and liabilities are computed based on the difference between the consolidated financial statement carrying amount and tax basis of assets and liabilities using enacted tax rates and laws for the years in which these items are expected to reverse. If management determines that some portion or all of a deferred tax asset is not “more likely than not” to be realized, a valuation allowance is recorded as a component of the income tax provision to reduce the deferred tax asset to an appropriate level in that period. In determining the need for a valuation allowance, management considers all positive and negative evidence, including historical earnings, projected future taxable income, future reversals of existing taxable temporary differences, taxable income in prior carryback periods, and prudent, feasible tax-planning strategies. The Company periodically assesses its tax positions for all periods open to examination by tax authorities based on the latest available information. Where it is not more likely than not that the Company’s tax position will be sustained, the Company records its best estimate of the resulting tax liability, penalties, and interest in the consolidated financial statements. These uncertain tax positions are recorded as a component of income tax expense. As uncertain tax positions in periods open to examination are closed out, or as new information becomes available, the resulting change is reflected in the recorded liability and income tax expense. Penalties and interest recognized related to the reserves for uncertain tax positions are recorded as a component of income tax expense.
Comprehensive Income	Comprehensive Income Comprehensive income is the change in equity of a business enterprise during a period from transactions and other events and circumstances from nonowner sources, and is presented in the consolidated statements of comprehensive income. Accumulated other comprehensive loss as of March 31, 2017 and 2016 consisted of net unrealized losses on the Company’s defined and postretirement benefit plans.
Share-Based Payments	Share-Based Payments Share-based payments to employees are recognized in the consolidated statements of operations based on their grant date fair values with the expense recognized on an accelerated basis over the vesting period. The Company uses the Black-Scholes option-pricing model to determine the fair value of its awards at the time of the grant.
Defined Benefit Plan and Other Postretirement Benefits	Defined Benefit Plan and Other Postretirement Benefits The Company recognizes the underfunded status of defined benefit plans on the consolidated balance sheets within other long-term liabilities. Gains and losses, and prior service costs and credits that have not yet been recognized through net periodic benefit cost are recognized in accumulated other comprehensive income (loss), net of tax effects, and will be amortized as a component of net periodic cost in future periods. The measurement date, the date at which the benefit obligations are measured, is the Company’s fiscal year-end. The Company also offers medical and dental benefits to inactive employees (and their eligible dependents) on long-term disability. These benefits do not vary with an employee's years of service; therefore, the Company is required to accrue the costs of the benefits at the date the inactive employee become disability eligible and elects to participate in the benefit. The accrued cost for such benefits is calculated using an actuarial estimate of the present value of all future benefit payments for obligations at the end of the fiscal year. During the three months ended March 31, 2017 the Company identified misstatements related to unrecognized accrued costs, goodwill, deferred tax assets, and related effects on earnings associated with these benefits in previously issued consolidated financial statements. The Company evaluated the effects of the misstatements to the Company's current and prior period consolidated financial statements and determined the impact was immaterial. As result, the effects of the immaterial misstatements have been corrected in the current period. Refer to Notes 5, 12 and 13 for further discussion.
Self-Funded Medical Plans	Self-Funded Medical Plans The Company maintains self-funded medical insurance. Self-funded plans include Consumer Driven Health Plans with a Health Savings Account option and traditional choice plans. Further, self-funded plans also include prescription drug and dental benefits. The Company records an incurred but unreported claim liability in the accrued compensation and benefits line of the consolidated balance sheets for self-funded plans based on an actuarial valuation. The estimate of the incurred but unreported claim liability was provided by a third-party valuation firm, primarily based on claims and participant data for the medical, dental, and pharmacy related costs.
Fair Value Measurements	Fair Value Measurements Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. In determining fair value, we consider the principal or most advantageous market in which the asset or liability would transact, and if necessary, consider assumptions that market participants would use when pricing the asset or liability. The accounting guidance for fair value measurements establishes a three-level fair value hierarchy that prioritizes the inputs used in measuring fair value as follows: observable inputs such as quoted prices in active markets (Level 1); inputs other than quoted prices in active markets that are observable either directly or indirectly (Level 2); and unobservable inputs in which there is little or no market data, which requires the Company to develop its own assumptions (Level 3). Assets and liabilities are classified in their entirety within the fair value hierarchy based on the lowest level input that is significant to the fair value measurement. See Note 18 to our consolidated financial statements for additional information on the Company’s fair value measurements.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (FASB) issued a new standard that will replace existing revenue recognition standards and significantly expand the disclosure requirements for revenue arrangements. In July 2015, the FASB approved a one year delay in the effective date of the standard, which will now be effective for the Company beginning on April 1, 2018 (i.e., beginning with the first quarter fiscal 2019 interim financial statements). The Company anticipates adopting the new revenue standard using the full retrospective transition method; however, the Company's ability to adopt using the full retrospective method is dependent on system and process readiness and the completion of our analysis of information necessary to recast our prior period financial statements. A dedicated implementation team has been established that continues to make progress toward completing the evaluation of the impact of the new standard. An initial accounting assessment of the new standard has been completed and the Company is not currently expecting significant changes related to recognizing revenue and earnings over time for long-term contracts as work progresses because of the continuous transfer of control to the customer, generally using an input measure (e.g., costs incurred) to reflect progress. The Company is also continuing to evaluate the impact of the new standard in other areas, including contract modifications and estimation and recognition of variable consideration for contracts to provide services. The Company is in the process of quantifying the financial statement impacts, revising current accounting policies, evaluating changes to internal controls, and determining the appropriate changes to business processes. In March 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting, which simplifies several aspects of the accounting for share-based payment transactions including the accounting for income taxes, forfeitures, and statutory tax withholding requirements. The ASU is effective for annual reporting periods beginning after December 15, 2016, with early adoption permitted. The Company plans to adopt ASU 2016-09 in the first quarter of fiscal 2018. In February 2016, the FASB issued ASU 2016-02, Leases, to increase transparency and comparability of accounting for lease transactions. The new standard requires lessees to recognize lease assets and lease liabilities on their balance sheet for all leases with a lease term of greater than 12 months. Lessor accounting is largely unchanged. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, with early adoption permitted. The Company is assessing what effect the adoption of this standard may have on the consolidated financial statements. Other recent accounting pronouncements issued by the FASB during fiscal 2017 and through the filing date did not and are not believed by management to have a material impact on the Company's present or historical consolidated financial statements.

Earnings Per Share (Tables)

12 Months Ended

Mar. 31, 2017

Earnings Per Share [Abstract]

Reconciliation of the income used to compute basic and diluted EPS



	Fiscal Year Ended March 31,
	2017		2016		2015
Earnings for basic computations (1)	$	250,231	$	290,542	$	229,093
Weighted-average Class A Common Stock outstanding	148,218,968		146,494,407		144,809,906
Weighted-average Class B Non-Voting Common Stock outstanding	—		—		222,129
Weighted-average Class C Restricted Common Stock outstanding	—		—		382,085
Total weighted-average common shares outstanding for basic computations	148,218,968		146,494,407		145,414,120
Earnings for diluted computations (1)	$	250,249	$	290,596	$	229,101
Dilutive stock options and restricted stock	2,055,672		3,224,730		4,961,411
Average number of common shares outstanding for diluted computations	150,274,640		149,719,137		150,375,531
Earnings per common share
Basic	$	1.69	$	1.98	$	1.58
Diluted	$	1.67	$	1.94	$	1.52

Acquisition (Tables)

12 Months Ended

Mar. 31, 2017

Business Combinations [Abstract]

Schedule of Consideration Transferred

The following table summarizes the preliminary determination of the total consideration transferred at the acquisition date of January 24, 2017:



Cash purchase price paid to Aquilent shareholders	$	250,000
Working capital and other closing adjustments	(1,570		)
Acquired cash on hand	2,998
Acquisition-related compensation expenses	(1,291		)
Acquisition-related contingent consideration	3,576
Total estimated purchase consideration and liabilities paid at closing	$	253,713

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed

The following table represents the preliminary fair value of assets acquired and liabilities assumed as of the acquisition date:



Preliminary allocation:
Current assets	$	15,809
Other tangible assets	1,144
Customer-relationship intangible assets	69,000
Goodwill	199,830
Current liabilities	(8,295		)
Tax indemnification liability	(13,554		)
Income tax uncertainty	(10,221		)
Estimated total purchase consideration and liabilities paid at closing	$	253,713

Goodwill and Intangible Assets (Tables)

12 Months Ended

Mar. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible assets

Intangible assets consisted of the following:



	March 31, 2017						March 31, 2016
	Gross Carrying Value		Accumulated Amortization		Net Carrying Value		Gross Carrying Value		Accumulated Amortization		Net Carrying Value
Amortizable intangible assets:
Customer relationships and other amortizable intangible assets	$	274,915	$	193,235	$	81,680	$	209,759	$	179,301	$	30,458

Unamortizable intangible assets:
Trade name	$	190,200	$	—	$	190,200	$	190,200	$	—	$	190,200

Total	$	465,115	$	193,235	$	271,880	$	399,959	$	179,301	$	220,658

Expected amortization expense for intangible assets

The following table summarizes the estimated annual amortization expense for future periods indicated below:



For the Fiscal Year Ended March 31,
2018	$	16,026
2019	13,742
2020	11,004
2021	9,011
2022	7,647
Thereafter	24,250
Total estimated amortization expense	$	81,680

Accounts Receivable, Net (Tables)

12 Months Ended

Mar. 31, 2017

Receivables [Abstract]

Accounts receivable, net

Accounts receivable, net consisted of the following:



	March 31,
	2017		2016
Current
Accounts receivable–billed	$	340,716	$	308,670
Accounts receivable–unbilled	651,094		584,275
Allowance for doubtful accounts	—		(656		)
Accounts receivable, net	991,810		892,289
Long-term
Accounts receivable–unbilled	59,913		51,145
Total accounts receivable, net	$	1,051,723	$	943,434

Property and Equipment, Net (Tables)

12 Months Ended

Mar. 31, 2017

Property, Plant and Equipment [Abstract]

Components of property and equipment, net

The components of property and equipment, net were as follows:



	March 31,
	2017			2016
Furniture and equipment	$	151,552		$	145,292
Computer equipment	75,159			69,075
Software	48,361			48,316
Leasehold improvements	177,009			155,803
Total	452,081			418,486
Less: Accumulated depreciation and amortization	(312,914		)	(288,317		)
Property and equipment, net	$	139,167		$	130,169

Accounts Payable and Other Accrued Expenses (Tables)

12 Months Ended

Mar. 31, 2017

Payables and Accruals [Abstract]

Schedule of accounts payable and other accrued expenses

Accounts payable and other accrued expenses consisted of the following:



	March 31,
	2017		2016
Vendor payables	$	268,630	$	246,670
Accrued expenses	235,487		238,099
Total accounts payable and other accrued expenses	$	504,117	$	484,769

Deferred Payment Obligation (Tables)

12 Months Ended

Mar. 31, 2017

Other Liabilities Disclosure [Abstract]

Deferred payment obligation

A reconciliation of the principal balance of the DPO to the amount recorded in the consolidated balance sheets for the periods presented are as follows:



	March 31,
	2017		2016
Deferred payment obligation:	$	80,000	$	80,000
Indemnified pre-acquisition uncertain tax positions	—		(21,407		)
Release of indemnified pre-acquisition uncertain tax positions	—		21,407
Accrued interest	1,304		1,319
Amount recorded in the consolidated balance sheet	$	81,304	$	81,319

Accrued Compensation and Benefits (Tables)

12 Months Ended

Mar. 31, 2017

Accrued compensation and benefits

Accrued compensation and benefits consisted of the following:



	March 31,
	2017		2016
Bonus	$	77,765	$	73,040
Retirement	31,879		30,388
Vacation	124,486		114,599
Other	29,686		23,340
Total accrued compensation and benefits	$	263,816	$	241,367

Debt (Tables)

12 Months Ended

Mar. 31, 2017

Debt Disclosure [Abstract]

Debt

Debt consisted of the following:



	March 31, 2017					March 31, 2016
	Interest Rate		Outstanding Balance			Interest Rate		Outstanding Balance
Term Loan A	2.98	%	$	1,153,425		2.94	%	$	741,813
Term Loan B	3.08	%	398,000			3.75	%	841,188
Revolving credit facility (ABR)	5.00	%	80,000			5.00	%	35,000
Revolving credit facility (LIBOR)	2.98	%	50,000			—	%	—
Less: Unamortized debt issuance costs and discount on debt			(18,101		)			(20,740		)
Total			1,663,324					1,597,261
Less: Current portion of long-term debt			(193,150		)			(112,813		)
Long-term debt, net of current portion			$	1,470,174				$	1,484,448

Future debt principal repayments

The following table summarizes required future debt principal repayments on the term loans:



	Payments Due By March 31,
	Total		2018		2019		2020		2021		2022		Thereafter
Term Loan A	$	1,153,425	$	59,150	$	59,150	$	59,150	$	59,150	$	916,825	$	—
Term Loan B	398,000		4,000		4,000		4,000		4,000		4,000		378,000
Total	$	1,551,425	$	63,150	$	63,150	$	63,150	$	63,150	$	920,825	$	378,000

Interest expense

Interest on debt and debt-like instruments consisted of the following:



	Fiscal Year Ended March 31,
	2017		2016		2015
	(In thousands)
Term Loan A Interest Expense	$	28,646	$	21,790	$	22,189
Term Loan B Interest Expense	18,874		32,070		33,079
Interest on Revolving Credit Facility	751		363		68
Deferred Payment Obligation Interest ¹	7,985		8,015		8,000
Amortization of Debt Issuance Costs (DIC) and Original Issue Discount (OID) ²	5,683		8,359		8,331
Other	359		218		165
Total Interest Expense	$	62,298	$	70,815	$	71,832

¹ Interest payments on the deferred payment obligation are made twice a year in January and July. See Note 10.

Income Taxes (Tables)

12 Months Ended

Mar. 31, 2017

Income Tax Disclosure [Abstract]

Components of income tax expense

The components of income tax expense were as follows:



	Fiscal Year Ended March 31,
	2017			2016			2015
Current
U.S. Federal	$	119,601		$	61,339		$	133,400
State and local	24,273			20,480			22,492
Total current	143,874			81,819			155,892
Deferred
U.S. Federal	18,451			8,664			(2,938		)
State and local	(2,915		)	(5,115		)	395
Total deferred	15,536			3,549			(2,543		)
Total	$	159,410		$	85,368		$	153,349

Effective income tax rate reconciliation



	Fiscal Year Ended March 31,
	2017			2016			2015
Income tax expense computed at U.S. federal statutory rate (35%)	$	144,165		$	132,812		$	135,071
Increases (reductions) resulting from:
Changes in uncertain tax positions	(92		)	(56,428		)	1,038
State and local income taxes, net of federal tax	13,882			10,092			15,039
Meals and entertainment	1,328			1,321			1,513
Other	127			(2,429		)	688
Income tax expense from operations	$	159,410		$	85,368		$	153,349

Components of deferred tax assets and liabilities

ignificant components of the Company’s deferred income tax assets and liabilties were as follows:



	March 31,
	2017			2016
Deferred income tax assets:
Accrued expenses	$	85,459		$	85,412
Accrued compensation	41,421			35,950
Stock-based compensation	15,326			20,032
Pension and postretirement benefits	48,672			46,743
Property and equipment	3,885			14,760
Capital loss carryforwards	246			283
Deferred rent and tenant allowance	25,167			20,964
Extended disability benefits	8,860			—
Other	6,817			4,793
Total gross deferred income tax assets	235,853			228,937
Less: Valuation allowance	—			—
Total net deferred income tax assets	235,853			228,937
Deferred income tax liabilities:
Unbilled receivables	(141,357		)	(122,744		)
Intangible assets	(78,871		)	(80,604		)
Debt issuance costs	(4,709		)	(3,354		)
Other	(91		)	(181		)
Total deferred income tax liabilities	(225,028		)	(206,883		)
Net deferred income tax asset	$	10,825		$	22,054

Potential tax benefits roll forward

A reconciliation of the beginning and ending amount of potential tax benefits for the periods presented is as follows:



	March 31,
	2017			2016			2015
Beginning of year	$	1,449		$	55,164		$	54,966
Increases in prior year position	127			79			27
Increases in current year position	10,278			—			203
Settlements with taxing authorities	—			(2,581		)	(32		)
Lapse of statute of limitations	(266		)	(51,213		)	—
End of year	$	11,588		$	1,449		$	55,164

Employee Benefit Plans (Tables)

12 Months Ended

Mar. 31, 2017

Compensation and Retirement Disclosure [Abstract]

Components of net postretirement medical expense

The components of net postretirement medical expense for the Officer Medical Plan were as follows:



	Fiscal Year Ended March 31,
	2017		2016		2015
Service cost	$	4,851	$	5,702	$	4,086
Interest cost	4,782		4,505		3,568
Net actuarial loss	3,052		3,536		582
Total postretirement medical expense	$	12,685	$	13,743	$	8,236

Weighted-average discount rate for benefit obligation

The weighted-average discount rate used to determine the year-end benefit obligations was as follows:



	Fiscal Year Ended March 31,
	2017		2016		2015
Officer Medical Plan	4.30	%	4.25	%	4.25	%
Retired Officers’ Bonus Plan	4.30	%	4.25	%	4.25	%
Retired Vice Presidents' Bonus Plan	4.30	%	—	%	—	%

Assumed health care cost trend rates

Assumed healthcare cost trend rates for the Officer Medical Plan at March 31, 2017 and 2016 were as follows:



Pre-65 initial rate	2017		2016
Healthcare cost trend rate assumed for next year	7.25	%	7.50	%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	4.50	%	4.50	%
Year that the rate reaches the ultimate trend rate	2024		2024



Post-65 initial rate	2017		2016
Healthcare cost trend rate assumed for next year	8.50	%	9.00	%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	4.50	%	4.50	%
Year that the rate reaches the ultimate trend rate	2024		2024

Effect of one-percentage-point change in assumed health care cost trend rates

A one-percentage-point change in assumed healthcare cost trend rates calculated as of March 31, 2017 would have the following effects:



	1% Increase		1% Decrease
Effect on total of service and interest cost	$	2,160	$	(1,667	)
Effect on postretirement benefit obligation	20,446		(16,374		)

Change in Benefit Obligation

The changes in the benefit obligation, plan assets, and funded status of the Officer Medical Plan were as follows:



	Fiscal Year Ended March 31,
	2017			2016			2015
Benefit obligation, beginning of the year	$	114,008		$	107,317		$	75,902
Service cost	4,851			5,702			4,086
Interest cost	4,782			4,505			3,568
Net actuarial (gain) loss	(2,219		)	(496		)	26,293
Benefits paid	(3,333		)	(3,020		)	(2,532		)
Benefit obligation, end of the year	$	118,089		$	114,008		$	107,317

Change in fair value of plan assets



	Fiscal Year Ended March 31,
Changes in plan assets	2017			2016			2015
Fair value of plan assets, beginning of the year	$	—		$	—		$	—
Employer contributions	3,333			3,020			2,532
Benefits paid	(3,333		)	(3,020		)	(2,532		)
Fair value of plan assets, end of the year	$	—		$	—		$	—

Expected future benefit payments

The expected future medical benefit payments and related contributions are as follows:




For the Fiscal Year Ending March 31,
2018	$	3,303
2019	$	3,691
2020	$	4,081
2021	$	4,605
2022	$	5,041
2023 - 2027	$	30,862

Accumulated Other Comprehensive Loss (Tables)

12 Months Ended

Mar. 31, 2017

Equity [Abstract]

Schedule of accumulated other comprehensive loss

The following table represents a roll-forward of amounts recognized in accumulated other comprehensive loss, net of tax:



	March 31,
	2017			2016			2015
Beginning of year	$	(19,613	)	$	(22,159	)	$	(6,636	)
Other comprehensive income (loss) before reclassifications	688			404			(15,873		)
Amounts reclassified from accumulated other comprehensive loss	1,848			2,142			350
Net current-period other comprehensive income (loss)	2,536			2,546			(15,523		)
End of year	$	(17,077	)	$	(19,613	)	$	(22,159	)

Reclassifications out of accumulated other comprehensive loss to net income

The following table presents the reclassifications out of accumulated other comprehensive loss to net income:



	March 31,
	2017			2016			2015
Amortization of net actuarial loss included in net periodic benefit cost (See Note 13)
Total before tax	$	3,050		$	3,536		$	577
Tax benefit	(1,202		)	(1,394		)	(227		)
Net of tax	$	1,848		$	2,142		$	350

Other Long -Term Liabilities (Tables)

12 Months Ended

Mar. 31, 2017

Other Liabilities Disclosure [Abstract]

Other long-term liabilities

Other long-term liabilities consisted of the following:



	March 31,
	2017		2016
Deferred rent	$	63,854	$	53,170
Postretirement benefit obligations	123,492		118,554
Other (1)	28,946		4,081
Total other long-term liabilities	$	216,292	$	175,805

Stockholders Equity (Tables)

12 Months Ended

Mar. 31, 2017

Equity [Abstract]

Dividends Declared

The following table summarizes the cash distributions recognized in the consolidated statement of cash flows:



	Fiscal Year Ended March 31,
	2017		2016		2015
Recurring dividends (1)	$	92,925	$	80,015	$	67,846
Special dividends (2)	—		—		147,248
Dividend equivalents (3)	2,254		31,802		47,110
Total distributions	$	95,179	$	111,817	$	262,204

(1) Amounts represent recurring quarterly dividends that were declared and paid for during each quarter of fiscal 2017, 2016, and 2015.

(2) Amount represents aggregate special dividends of $1.00 per share ($1.00 paid on August 29, 2014) that were declared and paid for during fiscal 2015.

(3) Dividend equivalents are distributions made to option holders equal to the special dividends declared and paid.

Stock-Based Compensation (Tables)

12 Months Ended

Mar. 31, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-based compensation expense recognized in the consolidated statements of operations

The following table summarizes stock-based compensation expense recognized in the consolidated statements of operations:



	Fiscal Year Ended March 31,
	2017		2016		2015
Cost of revenue	$	5,756	$	7,001	$	8,652
General and administrative expenses	15,493		17,991		17,511
Total	$	21,249	$	24,992	$	26,163

The following table summarizes the total stock-based compensation expense recognized in the consolidated statements of operations by the following types of equity awards:



	Fiscal Year Ended March 31,
	2017		2016		2015
Equity Incentive Plan Options	$	2,523	$	3,702	$	4,897
Class A Restricted Common Stock	18,726		21,290		21,266
Total	$	21,249	$	24,992	$	26,163

Schedule of unrecognized compensation cost

Absent the effect of accelerating stock compensation cost for any departures of employees who may continue to vest in their equity awards, the following tables summarize the unrecognized compensation cost, the weighted average period the cost is expected to be amortized, and the estimated annual compensation cost for the future periods indicated below (excludes any future awards):



	Unrecognized Compensation Cost				Weighted Average Remaining Period to be Recognized
	March 31, 2017		March 31, 2016		March 31, 2017	March 31, 2016
Equity Incentive Plan Options	$	1,777	$	4,324	2.84	2.77
Class A Restricted Common Stock	11,007		15,951		1.75	2.02
Total	$	12,784	$	20,275



	Total Unrecognized Compensation Cost
	Total		2018		2019		2020		2021		2022
Equity Incentive Plan Options	$	1,777	$	1,050	$	497	$	197	$	31	$	2
Class A Restricted Common Stock	11,007		8,542		2,183		282		—		—
Total	$	12,784	$	9,592	$	2,680	$	479	$	31	$	2

Shares withheld to cover taxes

As a result of these transactions, the Company repurchased a total of 308,793 shares and recorded them as treasury shares at a cost of $10.0 million, detailed as follows:



Total Shares Withheld to Cover Taxes
Trade Date	Shares	Cost	Total
April 1, 2016	19	$30.55	$	580
April 11, 2016	9	$29.29	264
April 18, 2016	1	$28.37	28
June 30, 2016	154,012	$29.64	4,564,916
July 11, 2016	6	$30.18	181
December 6, 2016	10	$37.96	380
March 31, 2017	154,736	$35.39	5,476,107
Total	308,793		$	10,042,456

Black Scholes weighted average assumptions

The weighted average assumptions used in the Black-Scholes option-pricing model for stock option awards were as follows:



	For The Fiscal Year Ended March 31,
	2017	2016	2015
Dividend yield	1.94%	1.83%	1.90%
Expected volatility	29.65%	29.85%	30.42%
Risk-free interest rate	1.38%	1.33%	1.60%
Expected life (in years)	5.00	5.08	5.00
Weighted-average grant date fair value	$7.16	$6.67	$5.55

Recorded stock-based compensation liabilities

Unvested restricted stock activity

The following table summarizes unvested restricted stock activity for the periods presented:



	Number of Shares	Weighted Average Grant Date Fair Value

Unvested Restricted Stock Awards
Unvested at March 31, 2016	1,759,952	23.00
Granted	473,247	29.69
Vested	946,393	22.63
Forfeited	9,298	28.98
Unvested at March 31, 2017	1,277,508	25.71

Stock options outstanding

The following table summarizes stock option activity for the periods presented:



	Number of Options	Weighted Average Exercise Price
Equity Incentive Plan Options
Options outstanding at March 31, 2016	5,793,008	$	11.82	*
Granted	48,898	31.57
Forfeited	82,422	20.85
Expired	3,752	27.16
Exercised	1,931,495	7.60
Options outstanding at March 31, 2017	3,824,237	$	13.99	*

* Reflects exercise price adjustment of $6.36 per grant for the $6.50 dividend per share issued July 30, 2012.

The following table summarizes unvested stock options for the periods presented:



	Number of Options	Weighted Average Grant Date Fair Value
Equity Incentive Plan Options
Unvested at March 31, 2016	1,565,841	$	5.73
Granted	48,898	7.16
Vested	719,756	6.02
Forfeited	82,422	5.33
Unvested at March 31, 2017	812,561	$	5.61

The following table summarizes stock options outstanding at March 31, 2017:



Range of exercise prices	Stock Options Outstanding	Weighted Average Exercise Price		Weighted Average Remaining Contractual Life	Intrinsic Value		Stock Options Exercisable	Weighted Average Exercise Price	Weighted Average Remaining Contractual Life	Intrinsic Value
				(In years)					(In years)
Equity Incentive Plan
$4.28 - $35.83	3,824,237	$13.99	(1)	4.78	$	81,817	3,011,676	$11.79	4.18	$71,073

(1) Reflects exercise price adjustment of $6.36 per grant for the $6.50 dividend per share issued July 30, 2012.

Fair Value Measurements (Tables)

12 Months Ended

Mar. 31, 2017

Fair Value Disclosures [Abstract]

Recurring Fair Value Measurements

The financial instruments measured at fair value in the accompanying consolidated balance sheets consist of the following:



	Recurring Fair Value Measurements as of March 31, 2017
	Level 1		Level 2		Level 3		Total
Cash and cash equivalents:
Cash and cash equivalents	$	59,825	$	—	$	—	$	59,825
Money market funds (1)	—		157,592		—		157,592
Total cash and cash equivalents	$	59,825	$	157,592	$	—	$	217,417
Liabilities:
Contingent consideration liability (2)	—		—		3,576		3,576
Total liabilities	$	—	$	—	$	3,576	$	3,576



	Recurring Fair Value Measurements as of March 31, 2016
	Level 1		Level 2		Level 3		Total
Cash and cash equivalents:
Cash and cash equivalents	$	42,102	$	—	$	—	$	42,102
Money market funds (1)	—		145,427		—		145,427
Total cash and cash equivalents	$	42,102	$	145,427	$	—	$	187,529

- Definition

Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.

+ References + Details

Commitments and Contingencies (Tables)

12 Months Ended

Mar. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Future minimum operating lease payments

Future minimum operating lease payments for noncancelable operating leases and future minimum income for noncancelable sublease rentals are summarized as follows:



For the Fiscal Year Ending March 31,	Operating Lease Payments		Operating Sublease Income
2018	$	70,119	$	386
2019	63,198		184
2020	54,846		54
2021	50,033		41
2022	38,183		20
Thereafter	107,562		—
	$	383,941	$	685

- Definition

Tabular disclosure of a lessee's leasing arrangements including: (1) the basis on which contingent rental payments are determined, (2) the existence and terms of renewal or purchase options and escalation clauses, (3) restrictions imposed by lease arrangements, such as those concerning dividends, additional debt, and further leasing, (4) rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions. Disclosure may also include the specific period used to amortize material leasehold improvements made at the inception of the lease or during the lease term. Additionally, for operating leases having initial or remaining noncancelable lease terms in excess of one year: (a) future minimum rental payments required as of the date of the latest balance sheet presented, in the aggregate and for each of the five succeeding fiscal years, (b) the total of minimum rentals to be received in the future under noncancelable subleases as of the date of the latest balance sheet presented, and (c) for all operating leases, rental expense for each period for which an income statement is presented, with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included.

+ References + Details

Unaudited Quarterly Financial Data (Tables)

12 Months Ended

Mar. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Schedule of quarterly financial information



	2017 Quarters
	First		Second		Third		Fourth
Revenue	$	1,422,722	$	1,394,853	$	1,404,638	$	1,582,071
Operating income	129,301		117,661		108,124		129,161
Income before income taxes	113,364		97,747		92,615		108,174
Net income	67,817		62,830		55,590		66,253
Earnings per common share:
Basic (1)	$	0.46	$	0.42	$	0.37	$	0.44
Diluted (1)	$	0.45	$	0.41	$	0.37	$	0.44



	2016 Quarters
	First		Second		Third		Fourth
Revenue	$	1,351,604	$	1,322,154	$	1,307,663	$	1,424,317
Operating income	126,144		108,816		105,116		104,508
Income before income taxes	108,586		90,953		87,909		92,014
Net income	64,306		56,216		108,055		65,517
Earnings per common share:
Basic (1)	$	0.44	$	0.38	$	0.72	$	0.44
Diluted (1)	$	0.43	$	0.37	$	0.71	$	0.43

Supplemental Financial Information (Tables)

12 Months Ended

Mar. 31, 2017

Valuation and Qualifying Accounts [Abstract]

Schedule of Valuation and Qualifying Accounts [Table Text Block]

The following schedule summarizes valuation and qualifying accounts for the periods presented:



	Fiscal Year Ended March 31,
	2017			2016			2015
Allowance for doubtful accounts:
Beginning balance	$	656		$	357		$	1,457
Provision for doubtful accounts	(135		)	352			(1,100		)
Charges against allowance	(521		)	(53		)	—
Ending balance	$	—		$	656		$	357

Business Overview (Details)	12 Months Ended
Business Overview (Details)	Mar. 31, 2017 employees segments
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of operating segments \| segments	1
Number of employees \| employees	23,300

Summary of Significant Accounting Policies (Property, Plant and Equipment) (Details)	12 Months Ended
	Mar. 31, 2017
Furniture and equipment \| Minimum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Furniture and equipment \| Maximum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Computer equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	4 years
Software \| Minimum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Software \| Maximum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years

Summary of Significant Accounting Policies (Intangible Assets) (Details)	12 Months Ended
	Mar. 31, 2017
Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	12 years
Customer relationships \| Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years
Customer relationships \| Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	12 years

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]
Earnings for basic computations									$ 250,231	$ 290,542	$ 229,093
Weighted-average common shares outstanding for basic computations									148,218,968	146,494,407	145,414,120
Earnings for diluted computations									$ 250,249	$ 290,596	$ 229,101
Dilutive stock options and restricted stock									2,055,672	3,224,730	4,961,411
Average number of common shares outstanding for diluted computations									150,274,640	149,719,137	150,375,531
Earnings per common share, Basic	$ 0.44	$ 0.37	$ 0.42	$ 0.46	$ 0.44	$ 0.72	$ 0.38	$ 0.44	$ 1.69	$ 1.98	$ 1.58
Earnings per common share, Diluted	$ 0.44	$ 0.37	$ 0.41	$ 0.45	$ 0.43	$ 0.71	$ 0.37	$ 0.43	$ 1.67	$ 1.94	$ 1.52
Payments of Dividends									$ 92,925	$ 80,015	$ 215,094
Restricted Stock
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]
Unvested shares participating in the payment of the Company's dividends declared									1,300,000	1,800,000	2,200,000
Payments of Dividends									$ 900	$ 1,000	$ 3,200
Undistributed earnings (loss) allocated to participating securities, basic									1,400	2,500	300
Undistributed earnings (loss) allocated to participating securities, diluted									$ 1,400	$ 2,500	$ 200
Stock Options
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]
Antidilutive options excluded from the computation of EPS									50,000	600,000	300,000
Common stock, Class A
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]
Weighted-average common shares outstanding for basic computations									148,218,968	146,494,407	144,809,906
Non-voting common stock, Class B
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]
Weighted-average common shares outstanding for basic computations									0	0	222,129
Restricted common stock, Class C
Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]
Weighted-average common shares outstanding for basic computations									0	0	382,085

Acquisition - Schedule of Consideration Transferred (Details) - Aquilent $ in Thousands	Jan. 24, 2017 USD ($)
Business Acquisition [Line Items]
Cash purchase price paid to Aquilent shareholders	$ 250,000
Working capital and other closing adjustments	(1,570)
Acquired cash on hand	2,998
Acquisition-related compensation expenses	(1,291)
Acquisition-related contingent consideration	3,576
Total estimated purchase consideration and liabilities paid at closing	$ 253,713

Acquisition - Narrative (Details) - USD ($) $ in Thousands	Jan. 24, 2017	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Business Acquisition [Line Items]
Income tax uncertainty		$ 11,647	$ 1,517	$ 58,400
Goodwill		$ 1,571,190	$ 1,361,913
Aquilent
Business Acquisition [Line Items]
Acquisition-related contingent consideration	$ 3,576
Customer-relationship intangible assets	69,000
Tax indemnification liability	13,554
Income tax uncertainty	10,221
Goodwill	199,830
General and administrative expenses \| Aquilent
Business Acquisition [Line Items]
Preliminary transaction costs	4,000
Customer Relationship \| Aquilent
Business Acquisition [Line Items]
Customer-relationship intangible assets	$ 69,000
Finite-lived intangible asset, useful life (in years)	12 years

Acquisition - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Jan. 24, 2017	Mar. 31, 2016	Mar. 31, 2015
Preliminary allocation:
Goodwill	$ 1,571,190		$ 1,361,913
Income tax uncertainty	$ (11,647)		$ (1,517)	$ (58,400)
Aquilent
Preliminary allocation:
Current assets		$ 15,809
Other tangible assets		1,144
Customer-relationship intangible assets		69,000
Goodwill		199,830
Current liabilities		(8,295)
Tax indemnification liability		(13,554)
Income tax uncertainty		(10,221)
Estimated total purchase consideration and liabilities paid at closing		$ 253,713

Goodwill and Intangible Assets (Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Goodwill	$ 1,571,190	$ 1,361,913
Impact to goodwill
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Increase in goodwill due to immaterial misstatement	$ 9,400

Goodwill and Intangible Assets (Finite-Lived Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ 193,235	$ 179,301
Finite-Lived Intangible Assets, Net Carrying Value	81,680
Impairment of Intangible Assets, Finite-lived	3,800
Customer relationships and other amortizable intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	274,915	209,759
Accumulated Amortization	193,235	179,301
Finite-Lived Intangible Assets, Net Carrying Value	$ 81,680	$ 30,458

Goodwill and Intangilbe Assets (Indefinite-Lived Intangible Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Intangible Assets
Intangible Assets, Gross	$ 465,115	$ 399,959
Accumulated Amortization	193,235	179,301
Intangible Assets, Net	271,880	220,658
Trade name
Indefinite-lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets	$ 190,200	$ 190,200

Goodwill and Intangible Assets (Expected Amortization Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 13,900	$ 12,100	$ 10,700
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2018	16,026
2019	13,742
2020	11,004
2021	9,011
2022	7,647
Thereafter	24,250
Finite-Lived Intangible Assets, Net Carrying Value	81,680
Customer relationships and other amortizable intangible assets
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Finite-Lived Intangible Assets, Net Carrying Value	$ 81,680	$ 30,458
Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years
Minimum \| Customer relationships and other amortizable intangible assets
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	12 years
Maximum \| Customer relationships and other amortizable intangible assets
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	12 years
Weighted Average \| Customer relationships and other amortizable intangible assets
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	11 years

Accounts Receivable, Net (Details) - USD ($) $ in Thousands	12 Months Ended
Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable-billed	$ 340,716	$ 308,670
Allowance for doubtful accounts	0	(656)
Accounts receivable, net	991,810	892,289
Total accounts receivable, net	1,051,723	943,434
Provision for doubtful accounts	600	1,100	$ (1,000)
Accounts Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable-unbilled	651,094	584,275
Other Noncurrent Assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable-unbilled	$ 59,913	$ 51,145

Property and Equipment, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 452,081	$ 418,486
Accumulated depreciation and amortization	(312,914)	(288,317)
Property and equipment, net	139,167	130,169
Depreciation and amortization expense related to property and equipment	46,300	50,100	$ 52,700
Reduction to gross cost and accumulated depreciation for zero net book value assets	11,900	6,600
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	151,552	145,292
Computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	75,159	69,075
Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	48,361	48,316
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	177,009	155,803
Internally developed software
Property, Plant and Equipment [Line Items]
Property and equipment, net	$ 8,100	$ 6,900

Accounts Payable and Other Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Payables and Accruals [Abstract]
Vendor payables	$ 268,630	$ 246,670
Accrued expenses	235,487	238,099
Total accounts payable and other accrued expenses	$ 504,117	$ 484,769

Deferred Payment Obligation (Details) - USD ($)				9 Months Ended	12 Months Ended
Deferred Payment Obligation (Details) - USD ($)	Dec. 11, 2009	Dec. 11, 2009	Jul. 31, 2008	Dec. 31, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Sep. 30, 2015
Other Liabilities Disclosure [Abstract]
Deferred payment obligation, original amount			$ 158,000,000
Deferred payment obligation, term			8 years 6 months
Deferred payment obligation, payment pursuant of the Merger Agreement	$ 78,000,000	$ 78,000,000
Deferred payment obligation, payment	100,400,000
Deferred payment obligation, accrued interest payment	$ 22,400,000				$ 7,985,000	$ 8,015,000	$ 8,000,000
Deferred payment obligation					80,000,000	80,000,000
Pre-acquisition uncertain tax positions						56,900,000
Release of indemnified pre-acquisition uncertain tax positions				$ 21,407,000	0	21,407,000
Indemnified pre-acquisition uncertain tax positions					$ 0	0		$ (21,407,000)
Interest rate per six-month period on unpaid deferred payment obligation					5.00%
Accrued interest					$ 1,304,000	1,319,000
Deferred payment obligation, amount recorded in the consolidated balance sheets					$ 81,304,000	$ 81,319,000

Accrued Compensation and Benefits (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Compensation Related Costs [Abstract]
Bonus	$ 77,765	$ 73,040
Retirement	31,879	30,388
Vacation	124,486	114,599
Other	29,686	23,340
Total accrued compensation and benefits	$ 263,816	$ 241,367

Debt (Schedule of Debt) (Details) - USD ($) $ in Thousands	Feb. 05, 2017	Jul. 13, 2016	Mar. 31, 2017	Mar. 31, 2016
Long-term Debt, Current and Noncurrent [Abstract]
Unamortized debt issuance costs and discount on debt			$ (18,101)	$ (20,740)
Long-term debt			1,663,324	1,597,261
Less: Current portion of long-term debt			(193,150)	(112,813)
Long-term debt, net of current portion			1,470,174	$ 1,484,448
Secured Debt
Long-term Debt, Current and Noncurrent [Abstract]
Long-term Debt, Gross			$ 1,551,425
Secured Debt \| Term Loan A
Long-term Debt, Current and Noncurrent [Abstract]
Interest rate			2.98%	2.94%
Long-term Debt, Gross			$ 1,153,425	$ 741,813
Secured Debt \| Term Loan B
Long-term Debt, Current and Noncurrent [Abstract]
Interest rate			3.08%	3.75%
Long-term Debt, Gross			$ 398,000	$ 841,188
Revolving Credit Facility
Long-term Debt, Current and Noncurrent [Abstract]
Revolving credit facility			$ 130,000	$ 35,000
Alternative Base Rate (ABR) [Member] \| Revolving Credit Facility
Long-term Debt, Current and Noncurrent [Abstract]
Line of Credit Facility, Interest Rate at Period End			5.00%	5.00%
Revolving credit facility			$ 80,000	$ 35,000
London Interbank Offered Rate (LIBOR) \| Revolving Credit Facility
Long-term Debt, Current and Noncurrent [Abstract]
Line of Credit Facility, Interest Rate at Period End			2.98%
Revolving credit facility			$ 50,000
Other Expense [Member]
Debt Instrument [Line Items]
Write off of Deferred Debt Issuance Cost	$ 100	$ 5,500
General and administrative expenses
Long-term Debt, Current and Noncurrent [Abstract]
Write off of debt issuance costs and creditor fees not qualifying for deferral	$ 900	$ 3,400

Debt (Details) - USD ($) $ in Thousands			12 Months Ended
Debt (Details) - USD ($) $ in Thousands	Feb. 05, 2017	Jul. 13, 2016	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Debt Instrument [Line Items]
Long-term Debt, Maximum Expanded Loan Facility			$ 400,000
Interest Paid			49,062	$ 57,068	$ 50,074
Term Loan B
Debt Instrument [Line Items]
Interest Paid			19,500	34,700
Term Loan A
Debt Instrument [Line Items]
Interest Paid			28,800	22,000
Secured Debt \| Overnight Federal Funds Rate [Member]
Debt Instrument [Line Items]
Long-term debt, basis spread on variable rate	0.50%
Secured Debt \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Long-term debt, basis spread on variable rate	1.00%
Secured Debt \| Revolving Credit Facility \| Minimum
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage	0.30%
Secured Debt \| Revolving Credit Facility \| Maximum
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage	0.40%
Secured Debt \| Revolving Credit Facility \| London Interbank Offered Rate (LIBOR) \| Minimum
Debt Instrument [Line Items]
Long-term debt, basis spread on variable rate	1.50%
Secured Debt \| Revolving Credit Facility \| London Interbank Offered Rate (LIBOR) \| Maximum
Debt Instrument [Line Items]
Long-term debt, basis spread on variable rate	2.25%
Secured Debt \| Revolving Credit Facility \| Alternative Base Rate (ABR) [Member] \| Minimum
Debt Instrument [Line Items]
Long-term debt, basis spread on variable rate	0.50%
Secured Debt \| Revolving Credit Facility \| Alternative Base Rate (ABR) [Member] \| Maximum
Debt Instrument [Line Items]
Long-term debt, basis spread on variable rate	1.25%
Secured Debt \| Term Loan B
Debt Instrument [Line Items]
Term loan, face amount	$ 399,000		398,000
Proceeds from Issuance of Debt	$ 399,000
Quarterly periodic payment percentage, principal	0.25%
Secured Debt \| Term Loan B \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Long-term debt, basis spread on variable rate	2.25%
Secured Debt \| Term Loan B \| Alternative Base Rate (ABR) [Member]
Debt Instrument [Line Items]
Long-term debt, basis spread on variable rate	1.25%
Secured Debt \| Term Loan A
Debt Instrument [Line Items]
Proceeds from Issuance of Other Long-term Debt		$ 441,000
Term loan, face amount			1,153,000
Quarterly periodic payment percentage, principal	1.25%
Secured Debt \| Term Loan A \| London Interbank Offered Rate (LIBOR) \| Minimum
Debt Instrument [Line Items]
Long-term debt, basis spread on variable rate	1.50%
Secured Debt \| Term Loan A \| London Interbank Offered Rate (LIBOR) \| Maximum
Debt Instrument [Line Items]
Long-term debt, basis spread on variable rate	2.25%
Secured Debt \| Term Loan A \| Alternative Base Rate (ABR) [Member] \| Minimum
Debt Instrument [Line Items]
Long-term debt, basis spread on variable rate	0.50%
Secured Debt \| Term Loan A \| Alternative Base Rate (ABR) [Member] \| Maximum
Debt Instrument [Line Items]
Long-term debt, basis spread on variable rate	1.25%
Revolving Credit Facility
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity			500,000
Proceeds from line of credit			575,000	273,000
Revolving credit facility, amount outstanding			130,000	35,000
Revolving Credit Facility \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Revolving credit facility, amount outstanding			50,000
Revolving Credit Facility \| Alternative Base Rate (ABR) [Member]
Debt Instrument [Line Items]
Revolving credit facility, amount outstanding			80,000	$ 35,000
Letter of Credit
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity			$ 100,000
Other Expense [Member]
Debt Instrument [Line Items]
Write off of Deferred Debt Issuance Cost	$ 100	5,500
General and administrative expenses
Debt Instrument [Line Items]
Write off of debt issuance costs and creditor fees not qualifying for deferral	$ 900	$ 3,400

Debt (Future debt principal repayments) (Details) - Secured Debt - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Debt Instrument [Line Items]
Total	$ 1,551,425
2018	63,150
2019	63,150
2020	63,150
2021	63,150
2022	920,825
Thereafter	378,000
Term Loan A
Debt Instrument [Line Items]
Total	1,153,425	$ 741,813
2018	59,150
2019	59,150
2020	59,150
2021	59,150
2022	916,825
Thereafter	0
Term Loan B
Debt Instrument [Line Items]
Total	398,000	$ 841,188
2018	4,000
2019	4,000
2020	4,000
2021	4,000
2022	4,000
Thereafter	$ 378,000

Debt Debt (Detail of Interest Expense) (Details) - USD ($) $ in Thousands		12 Months Ended
	Dec. 11, 2009	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Debt Instrument [Line Items]
Deferred payment obligation, accrued interest payment	$ 22,400	$ 7,985	$ 8,015	$ 8,000
Amortization of Debt Issuance Costs (DIC) and Original Issue Discount (OID)		5,683	8,359	8,331
Interest Expense, Other		359	218	165
Interest Expense		62,298	70,815	71,832
Secured Debt \| Term Loan A
Debt Instrument [Line Items]
Interest Expense, Debt		28,646	21,790	22,189
Secured Debt \| Term Loan B
Debt Instrument [Line Items]
Interest Expense, Debt		18,874	32,070	33,079
Revolving Credit Facility
Debt Instrument [Line Items]
Interest Expense, Debt		$ 751	$ 363	$ 68

Income Taxes (Components of Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Current
U.S. Federal	$ 119,601	$ 61,339	$ 133,400
State and local	24,273	20,480	22,492
Total current	143,874	81,819	155,892
Deferred
U.S. Federal	18,451	8,664	(2,938)
State and local	(2,915)	(5,115)	395
Total deferred	15,536	3,549	(2,543)
Total	$ 159,410	$ 85,368	$ 153,349

Income Taxes (Reconciliation of Income Tax) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Federal statutory income tax rate	35.00%	35.00%	35.00%
Income tax expense computed at U.S. federal statutory rate (35%)	$ 144,165	$ 132,812	$ 135,071
Changes in uncertain tax positions	(92)	(56,428)	1,038
State and local income taxes, net of federal tax	13,882	10,092	15,039
Meals and entertainment	1,328	1,321	1,513
Other	127	(2,429)	688
Total	$ 159,410	$ 85,368	$ 153,349

Income Taxes (Components of Net Deferred Income Taxes) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Deferred income tax assets:
Accrued expenses	$ 85,459	$ 85,412
Accrued compensation	41,421	35,950
Stock-based compensation	15,326	20,032
Pension and postretirement benefits	48,672	46,743
Property and equipment	3,885	14,760
Capital loss carryforwards	246	283
Deferred rent and tenant allowance	25,167	20,964
Extended disability benefits	8,860	0
Other	6,817	4,793
Total gross deferred income tax assets	235,853	228,937
Less: Valuation allowance	0	0
Total net deferred income tax assets	235,853	228,937
Deferred income tax liabilities:
Unbilled receivables	(141,357)	(122,744)
Intangible assets	(78,871)	(80,604)
Debt issuance costs	(4,709)	(3,354)
Other	(91)	(181)
Total deferred income tax liabilities	(225,028)	(206,883)
Net deferred income tax asset	$ 10,825	$ 22,054

Income Taxes (Uncertain Tax Positions) (Details) - USD ($)	9 Months Ended	12 Months Ended
	Dec. 31, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Income tax reserve		$ 11,647,000	$ 1,517,000	$ 58,400,000
Pre-acquisition uncertain tax positions			56,900,000
Income tax reserve, accrued penalties and interest	$ 3,200,000	100,000	100,000	3,300,000
Release of indemnified pre-acquisition uncertain tax positions	21,407,000	0	21,407,000
Pre-acquisition Uncertain Tax Positions that May Be Indemnified Under the Remaining Available Deferred Payment Obligation		0	0		$ 21,407,000
Reconciliation of the beginning and ending amount of potential tax benefits
Beginning of year	$ 55,164,000	1,449,000	55,164,000	54,966,000
Increases in prior year position		127,000	79,000	27,000
Increases in current year position		10,278,000	0	203,000
Settlements with taxing authorities		0	(2,581,000)	(32,000)
Lapse of statute of limitations		(266,000)	(51,213,000)	0
End of year		11,588,000	1,449,000	55,164,000
Accrued interest and penalties		$ (9,000)	$ (3,200,000)	$ 800,000

Employee Benefit Plans (Additional Information) (Details) - USD ($)	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Employer Matching Contribution, Percent of Match	6.00%
Employees’ Capital Accumulation Plan, Total expense recognized	$ 116,600,000	$ 108,700,000	$ 110,700,000
Employees’ Capital Accumulation Plan, Company-paid contributions	114,800,000	$ 107,500,000	$ 124,800,000
Defined Benefit Plan Disclosure [Line Items]
Long-term disability obligation	22,500,000
Retired Officers' Bonus Plan
Defined Benefit Plan Disclosure [Line Items]
Deferred Compensation Arrangement with Individual, Annual Cash Award Granted per Year of Service, Amount	10,000
Impact to general and administrative expense
Defined Benefit Plan Disclosure [Line Items]
Cumulative effect of change recognized in earnings	$ 6,900,000

Employee Benefit Plans (Components of Net Postretirement Medical Expense) (Details) - Officer Medical Plan - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4,851	$ 5,702	$ 4,086
Interest cost	4,782	4,505	3,568
Net actuarial loss	3,052	3,536	582
Total postretirement medical expense	$ 12,685	$ 13,743	$ 8,236

Employee Benefit Plans (Weighted Average Discount Rate) (Details)	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Officer Medical Plan
Defined Benefit Plan Disclosure [Line Items]
Weighted-average discount rate for benefit obligation	4.30%	4.25%	4.25%
Retired Officers' Bonus Plan \| Officer
Defined Benefit Plan Disclosure [Line Items]
Weighted-average discount rate for benefit obligation	4.30%	4.25%	4.25%
Retired Officers' Bonus Plan \| Vice Presidents
Defined Benefit Plan Disclosure [Line Items]
Weighted-average discount rate for benefit obligation	4.30%	0.00%	0.00%

Employee Benefit Plans (Healthcare Cost Trend Rates) (Details) - Officer Medical Plan - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate assumed for next year, Pre 65	7.25%	7.50%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate), Pre 65	4.50%	4.50%
Year that the rate reaches the ultimate trend rate, Pre 65	2024	2024
Health care cost trend rate assumed for next year, Post 65	8.50%	9.00%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate), Post 65	4.50%	4.50%
Year that the rate reaches the ultimate trend rate, Post 65	2024	2024
Effect of one percentage point increase on total of service and interest cost	$ 2,160
Effect of one percentage point decrease on total of service and interest cost	(1,667)
Effect of one percentage point increase on postretirement benefit obligation	20,446
Effect of one percentage point decrease on postretirement benefit obligation	$ (16,374)

Employee Benefit Plans (Retired Officers' Bonus Plan and Retired VP Bonus Plan) (Details) - Retired Officers' Bonus Plan - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Officer
Defined Benefit Plan Disclosure [Line Items]
Retired Officers' Bonus Plan, total pension expense	$ 0.7	$ 0.7	$ 0.7
Benefits paid	0.9	0.3	$ 1.3
Defined benefit plan, funded status of plan	4.4	$ 4.5
Vice Presidents
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, funded status of plan	$ 1.0

Employee Benefit Plans (Accumulated Other Comprehensive Income) (Details) - USD ($)	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]
Unrecognized gross actuarial gain	$ 1,100,000	$ 700,000
Unrecognized actuarial gain, tax	400,000	$ 300,000
Amount to be amortized from accumulated other comprehensive income (loss) next fiscal year	2,300,000
Net prior service cost, accumulated other comprehensive income net periodic cost in fiscal 2016	100,000
Net transition (asset) obligation, accumulated other comprehensive income net periodic cost in fiscal 2016	$ 0

Employee Benefit Plans (Change in Benefit Obligation and Change in Plan Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Officer Medical Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning of the year	$ 114,008	$ 107,317	$ 75,902
Service cost	4,851	5,702	4,086
Interest cost	4,782	4,505	3,568
Net actuarial (gain) loss	(2,219)	(496)	26,293
Benefits paid	(3,333)	(3,020)	(2,532)
Benefit obligation, end of the year	118,089	114,008	107,317
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning of the year	0	0	0
Employer contributions	3,333	3,020	2,532
Benefits paid	(3,333)	(3,020)	(2,532)
Fair value of plan assets, end of the year	0	0	0
Defined benefit plan, funded status of plan	(118,100)	(114,000)
Officer and Vice President \| Retired Officers' Bonus Plan
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined benefit plan, funded status of plan	5,400
Officer \| Retired Officers' Bonus Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefits paid	(900)	(300)	(1,300)
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Benefits paid	(900)	(300)	$ (1,300)
Defined benefit plan, funded status of plan	$ 4,400	$ 4,500

Employee Benefit Plans (Future Benefit Payments) (Details) $ in Thousands	Mar. 31, 2017 USD ($)
Compensation and Retirement Disclosure [Abstract]
2018	$ 3,303
2019	3,691
2020	4,081
2021	4,605
2022	5,041
2023-2027	$ 30,862

Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Equity [Abstract]
Beginning of year	$ (19,613)	$ (22,159)	$ (6,636)
Other comprehensive income (loss) before reclassifications	688	404	(15,873)
Amounts reclassified from accumulated other comprehensive loss	1,848	2,142	350
Net current-period other comprehensive income (loss)	2,536	2,546	(15,523)
End of year	$ (17,077)	$ (19,613)	$ (22,159)

Accumulated Other Comprehensive Loss (Reclassifications out of Accumulated Other Comprehensive Loss to Net Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Tax benefit	$ (159,410)	$ (85,368)	$ (153,349)
Reclassification out of Accumulated Other Comprehensive Income \| Accumulated Defined Benefit Plans Adjustment
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	3,050	3,536	577
Tax benefit	(1,202)	(1,394)	(227)
Net of tax	$ 1,848	$ 2,142	$ 350

Other Long-Term Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Jan. 24, 2017	Mar. 31, 2016
Other Liabilities Disclosure [Abstract]
Deferred rent	$ 63,854		$ 53,170
Postretirement benefit obligatons	123,492		118,554
Other	28,946		4,081
Total other long-term liabilities	216,292		$ 175,805
Business Acquisition [Line Items]
Long-term disability obligation	$ 22,500
Aquilent
Business Acquisition [Line Items]
Acquisition-related contingent consideration		$ 3,576

Stockholders' Equity (Common Stock Shares Activity) (Details)	12 Months Ended
	Mar. 31, 2017 vote
Equity [Abstract]
Common stock votes per share	1

Stockholders' Equity (Employee Stock Purchase Plan and Share Repurchase Program) (Details) - USD ($)										12 Months Ended			77 Months Ended
	Mar. 31, 2017	Dec. 06, 2016	Jul. 11, 2016	Jun. 30, 2016	Apr. 18, 2016	Apr. 11, 2016	Apr. 01, 2016	Feb. 02, 2015	Nov. 05, 2014	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2017	Jan. 25, 2017	Jan. 27, 2015	Dec. 12, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share repurchase program, amount authorized														$ 410,000,000	$ 180,000,000	$ 30,000,000
Repurchase of common stock, in shares	154,736	10	6	154,012	1	9	19	1,000,000	1,000,000
Repurchase of common stock	$ 5,476,107	$ 380	$ 181	$ 4,564,916	$ 28	$ 264	$ 580			$ 56,455,000	$ 63,152,000	$ 62,140,000
Repurchase of common stock, cost per share	$ 35.39	$ 37.96	$ 30.18	$ 29.64	$ 28.37	$ 29.29	$ 30.55	$ 28.36	$ 25.10
Share repurchase program, remaining authorized repurchase amount	$ 255,300,000									$ 255,300,000			$ 255,300,000
Common stock, Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, Employee Stock Purchase Plans										201,558			1,934,907
Repurchase of common stock, in shares										1,306,388	2,100,000
Repurchase of common stock										$ 46,400,000	$ 54,900,000
Employee Stock Purchase Plan \| Common stock, Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock purchase plan, aggregate shares	10,000,000									10,000,000			10,000,000
Employee stock purchase plan, purchase price discount from the fair market value										5.00%

Stockholders' Equity (Dividends) (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Aug. 29, 2014	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends		$ 95,179	$ 111,817	$ 262,204
Ordinary Dividend
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends		92,925	80,015	67,846
Special Cash Dividend
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends		0	0	$ 147,248
Dividends paid	$ 1.00			$ 1.00
Dividend Equivalent
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends		$ 2,254	$ 31,802	$ 47,110

Stock-Based Compensation (Stock-based Compensation Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 21,249	$ 24,992	$ 26,163
EIP \| Stock Options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	2,523	3,702	4,897
Annual Incentive Plan \| Restricted Stock \| Common stock, Class A
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	18,726	21,290	21,266
Cost of revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	5,756	7,001	8,652
General and administrative expenses
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 15,493	$ 17,991	$ 17,511

Stock Based Compensation (Unrecognized Compensation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to unvested stock-based compensation agreements	$ 12,784	$ 20,275
Unrecognized compensation cost, amortization period	5 years
2018	$ 9,592
2019	2,680
2020	479
2021	31
2022	2
EIP \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to unvested stock-based compensation agreements	$ 1,777	$ 4,324
Unrecognized compensation cost, amortization period	2 years 10 months 2 days	2 years 9 months 7 days
2018	$ 1,050
2019	497
2020	197
2021	31
2022	2
Annual Incentive Plan \| Restricted Stock \| Common stock, Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to unvested stock-based compensation agreements	$ 11,007	$ 15,951
Unrecognized compensation cost, amortization period	1 year 9 months	2 years 7 days
2018	$ 8,542
2019	2,183
2020	282
2021	0
2022	$ 0

Stock-Based Compensation (Stock Plans) (Details) - USD ($)												12 Months Ended
	Mar. 31, 2017	Jan. 25, 2017	Dec. 06, 2016	Oct. 26, 2016	Jul. 11, 2016	Jun. 30, 2016	Apr. 18, 2016	Apr. 11, 2016	Apr. 01, 2016	Feb. 02, 2015	Nov. 05, 2014	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	May 18, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, amortization period												5 years
Share Price		$ 35.83													$ 28.94
Repurchase of common stock, in shares	154,736		10		6	154,012	1	9	19	1,000,000	1,000,000
Repurchase of common stock, cost per share	$ 35.39		$ 37.96		$ 30.18	$ 29.64	$ 28.37	$ 29.29	$ 30.55	$ 28.36	$ 25.10
Repurchase of common stock	$ 5,476,107		$ 380		$ 181	$ 4,564,916	$ 28	$ 264	$ 580			$ 56,455,000	$ 63,152,000	$ 62,140,000
Common stock, Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchase of common stock, in shares												1,306,388	2,100,000
Repurchase of common stock												$ 46,400,000	$ 54,900,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value												$ 7.16	$ 6.67	$ 5.55
Rollover Plan \| Restricted Stock \| Restricted common stock, Class C
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock purchase plan, aggregate shares	3,971,730											3,971,730	3,971,730
EIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period												473,247
Repurchase of common stock, in shares												308,793
Repurchase of common stock												$ 10,042,456
EIP \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period												10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period												5 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		5,812		43,086								48,898
Share-Based Compensation Arrangement By Share-based Payment Award, Options, Grants In Period, Grant Date Fair Value		$ 100,000.0		$ 300,000.0								$ 400,000	$ 3,400,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 8.60		$ 6.96								$ 7.16
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value												$ 11,800,000	14,900,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value												$ 49,000,000	$ 16,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	12,026,970											12,026,970	12,147,850
Unrecognized compensation cost, amortization period												2 years 10 months 2 days	2 years 9 months 7 days
EIP \| Restricted Stock \| Common stock, Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period												3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period												40,029
Share Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value												$ 30,200,000	$ 26,500,000
EIP \| Restricted Stock Units (RSUs) \| Common stock, Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period												433,218
Unrecognized compensation cost, amortization period												3 years
Share Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value												$ 14,100,000
Annual Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement By Share-based Payment Award, Annual Incentive Payment, Equity Portion, Increase Percentage	20.00%											20.00%
Annual Incentive Plan \| Restricted Stock \| Common stock, Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period												3 years
Unrecognized compensation cost, amortization period												1 year 9 months	2 years 7 days
Director \| EIP \| Restricted Stock \| Common stock, Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period												1 year
Special Cash Dividend \| EIP \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation liability, current	$ 1,000,000											$ 1,000,000	$ 2,300,000
Unrecognized compensation cost, amortization period													2 years

Stock-Based Compensation (Stock Option Assumptions) (Details) - $ / shares	3 Months Ended				12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield					1.94%	1.83%	1.90%
Expected volatility					29.65%	29.85%	30.42%
Risk-free interest rate					1.38%	1.33%	1.60%
Expected life (in years)					5 years	5 years 29 days	5 years
Granted, weighted average grant date fair value					$ 7.16	$ 6.67	$ 5.55
Stock Options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield					1.90%
Stock Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield					1.94%
Ordinary Dividend
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends declared per share	$ 0.17	$ 0.15	$ 0.15	$ 0.15

Stock-Based Compensation (Special Dividends) (Details) - USD ($)					3 Months Ended				12 Months Ended
	Mar. 31, 2016	Jun. 30, 2015	Jul. 30, 2014	Jul. 30, 2012	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Dividend Equivalent, Per Share									$ 1.00
Cash payment for special dividends									$ 2,254,000	$ 31,802,000	$ 47,110,000
Unrecognized compensation cost, amortization period									5 years
Special Cash Dividend
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends declared per share			$ 1.00	$ 6.50
Recorded and unrecorded stock-based compensation liability, current and noncurrent	$ 3,800,000				$ 1,300,000				$ 1,300,000	$ 3,800,000
Ordinary Dividend
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends declared per share					$ 0.17	$ 0.15	$ 0.15	$ 0.15
Stock Options \| EIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, amortization period									2 years 10 months 2 days	2 years 9 months 7 days
Stock Options \| Special Cash Dividend \| EIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash payment for special dividends	100,000	$ 2,200,000
Share-based compensation arrangement, plan modification, incremental compensation cost recognized in period									$ 200,000
Share-based compensation arrangement, plan modification, incremental compensation cost, deferred					$ 30,000				$ 30,000
Share-based compensation arrangement, plan modification, incremental compensation cost, deferred, recognition period									3 months
Stock-based compensation liability, current	2,300,000				1,000,000				$ 1,000,000	$ 2,300,000
Unrecorded stock-based compensation liability, current and noncurrent	1,500,000				$ 400,000				$ 400,000	$ 1,500,000
Unrecognized compensation cost, amortization period										2 years
Stock Options \| Special Cash Dividend \| Rollover Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecorded stock-based compensation liability, current and noncurrent	$ 0									$ 0	$ 0

Stock-Based Compensation (Stock Option and Restricted Stock Award Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands					3 Months Ended				12 Months Ended
	Jan. 25, 2017	Oct. 26, 2016	Jul. 30, 2014	Jul. 30, 2012	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Aug. 31, 2012
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Granted, weighted average grant date fair value									$ 7.16	$ 6.67	$ 5.55
EIP
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested, beginning balance								1,759,952	1,759,952
Unvested, beginning balance, weighted average grant date fair value					$ 25.71				$ 25.71	$ 23.00
Granted									473,247
Granted, weighted average grant date fair value									$ 29.69
Vested									946,393
Vested, weighted average grant date fair value									$ 22.63
Forfeited									9,298
Forfeited, weighted average grant date fair value									$ 28.98
Unvested, ending balance					1,277,508				1,277,508	1,759,952
Unvested, beginning balance, weighted average grant date fair value								$ 23.00	$ 23.00
EIP \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning balance								5,793,008	5,793,008
Outstanding, beginning balance, weighted average exercise price								$ 11.82	$ 11.82
Granted	5,812	43,086							48,898
Granted, weighted average exercise price									$ 31.57
Forfeited									82,422
Forfeited, weighted average exercise price									$ 20.85
Expired									3,752
Expired, weighted average exercise price									$ 27.16
Exercised									1,931,495
Exercised, weighted average exercise price									$ 7.60
Outstanding, ending balance					3,824,237				3,824,237	5,793,008
Outstanding, ending balance, weighted average exercise price					$ 13.99				$ 13.99	$ 11.82
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Unvested, beginning balance								1,565,841	1,565,841
Unvested, beginning balance, weighted average grant date fair value								$ 5.73	$ 5.73
Granted	5,812	43,086							48,898
Granted, weighted average grant date fair value	$ 8.60	$ 6.96							$ 7.16
Vested									719,756
Vested, weighted average grant date fair value									$ 6.02
Forfeited									82,422
Forfeited, weighted average grant date fair value									$ 5.33
Unvested, ending balance					812,561				812,561	1,565,841
Unvested, ending balance, weighted average grant date fair value					$ 5.61				$ 5.61	$ 5.73
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding, ending balance					3,824,237				3,824,237	5,793,008
Outstanding, ending balance, weighted average exercise price					$ 13.99				$ 13.99	$ 11.82
Outstanding, ending balance, weighted average remaining contractual life, in years									4 years 9 months 11 days
Outstanding, intrinsic value					$ 81,817				$ 81,817
Stock options exercisable					3,011,676				3,011,676
Stock options exercisable, weighted average exercise price					$ 11.79				$ 11.79
Stock options exercisable, weighted average remaining contractual life, in years									4 years 2 months 5 days
Stock options exercisable, intrinsic value					$ 71,073				$ 71,073
Ordinary Dividend
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Dividends declared per share					$ 0.17	$ 0.15	$ 0.15	$ 0.15
Special Cash Dividend
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Dividends declared per share			$ 1.00	$ 6.50
Special Cash Dividend \| EIP \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Dividend, option exercise price reduction, per share												$ 6.36
Stock Options \| EIP
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Exercise price, lower range limit										4.28
Exercise price, upper range limit										$ 29.38

Fair Value Measurements (Recurring Fair Value Measurements) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds, net asset value per share	$ 1.00
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash and cash equivalents	$ 217,417	$ 187,529
Total liabilities	3,576
Fair Value, Measurements, Recurring \| Contingent Consideration Liability
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities	3,576
Fair Value, Measurements, Recurring \| Cash and cash equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash and cash equivalents	59,825	42,102
Fair Value, Measurements, Recurring \| Money market fund
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash and cash equivalents	157,592	145,427
Fair Value, Measurements, Recurring \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash and cash equivalents	59,825	42,102
Fair Value, Measurements, Recurring \| Level 1 \| Cash and cash equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash and cash equivalents	59,825	42,102
Fair Value, Measurements, Recurring \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash and cash equivalents	157,592	145,427
Fair Value, Measurements, Recurring \| Level 2 \| Money market fund
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total cash and cash equivalents	157,592	$ 145,427
Fair Value, Measurements, Recurring \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities	3,576
Fair Value, Measurements, Recurring \| Level 3 \| Contingent Consideration Liability
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities	3,576
Fair Value, Measurements, Recurring \| Level 3 \| Liability
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business Combination, Contingent Consideration, Liability, Noncurrent	$ 3,576

Related-Party Transactions (Details) - USD ($)	12 Months Ended
Related-Party Transactions (Details) - USD ($)	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Jul. 31, 2008
Related Party Transaction [Line Items]
Management agreement, annual fee				$ 1,000,000.0
Management agreement, advisory fees	$ 750,000	$ 1,000,000	$ 1,000,000
Affiliated Entity [Member] \| Pledge Obligation [Member]
Related Party Transaction [Line Items]
Amount of pledge	$ 5,000,000

Commitments and Contingecies (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Rent expense, net	$ 81,600	$ 88,500	$ 92,900
Rent expense, sublease rentals	500	$ 500	$ 700
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2018	70,119
2019	63,198
2020	54,846
2021	50,033
2022	38,183
Thereafter	107,562
Operating leases, future minimum payments due	383,941
Operating Leases, Future Minimum Payments Due, Sublease Rentals, Fiscal Year Maturity [Abstract]
2018	386
2019	184
2020	54
2021	41
2022	20
Thereafter	0
Operating leases, future minimum payments due, future minimum sublease rentals	$ 685
Contracts with U.S. government agencies or other U.S. government contractors
Concentration Risk [Line Items]
Concentration risk, percentage	97.00%	97.00%	98.00%
Unfavorable Regulatory Action
Loss Contingencies [Line Items]
Liability for reductions and/or penalties from U.S Governement audits	$ 175,700	$ 189,900
Financial Standby Letter of Credit [Member]
Concentration Risk [Line Items]
Guarantor Obligations, Current Carrying Value	8,600	6,600
Guarantor Obligations, Liquidation Proceeds, Monetary Amount	1,700	1,800
Guarantor Obligations, Facility	10,000
Guarantor Obligations, Available Amount	$ 3,100	$ 5,200

Commitments and Contingencies (Litigation) (Details) - Former stockholder litigation $ in Millions			12 Months Ended	17 Months Ended	84 Months Ended
	Jan. 09, 2017 claims	Apr. 16, 2015 claims	Mar. 31, 2017 USD ($) claims	Dec. 15, 2009 plaintiffs claims	Mar. 31, 2017 claims	Sep. 24, 2014 claims	Sep. 23, 2014 claims	Sep. 07, 2010 claims	Jul. 02, 2010 claims
Loss Contingencies [Line Items]
Loss contingencies, number of plaintiffs \| plaintiffs				6
Loss contingencies, new claims filed, number				9
Loss contingencies, claims amended, number						1	2	1	3
Loss contingencies, claims dismissed, number					3
Loss contingencies, claims settled, number		1
Loss contingencies, pending claims, number			3		3
United States Court of Appeals for the Ninth Circuit
Loss Contingencies [Line Items]
Loss contingencies, claims dismissed, number	1
United States District Court for the Southern District of New York
Loss Contingencies [Line Items]
Loss contingencies, pending claims, number			3		3
RICO
Loss Contingencies [Line Items]
Loss contingencies, damages sought, value \| $			$ 241.7

Business Segment Information (Details)	12 Months Ended
Business Segment Information (Details)	Mar. 31, 2017 segments
Segment Reporting [Abstract]
Number of operating segments	1
Number of reportable segments	1

Unaudited Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 1,582,071	$ 1,404,638	$ 1,394,853	$ 1,422,722	$ 1,424,317	$ 1,307,663	$ 1,322,154	$ 1,351,604	$ 5,804,284	$ 5,405,738	$ 5,274,770
Operating income	129,161	108,124	117,661	129,301	104,508	105,116	108,816	126,144	484,247	444,584	458,822
Income before income taxes	108,174	92,615	97,747	113,364	92,014	87,909	90,953	108,586	411,900	379,462	385,918
Net income	$ 66,253	$ 55,590	$ 62,830	$ 67,817	$ 65,517	$ 108,055	$ 56,216	$ 64,306	$ 252,490	$ 294,094	$ 232,569
Earnings per common share:
Earnings per common share, Basic	$ 0.44	$ 0.37	$ 0.42	$ 0.46	$ 0.44	$ 0.72	$ 0.38	$ 0.44	$ 1.69	$ 1.98	$ 1.58
Earnings per common share, Diluted	$ 0.44	$ 0.37	$ 0.41	$ 0.45	$ 0.43	$ 0.71	$ 0.37	$ 0.43	$ 1.67	$ 1.94	$ 1.52

Supplemental Financial Information (Details) - Allowance for doubtful accounts - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ 656	$ 357	$ 1,457
Provision for doubtful accounts	(135)	352	(1,100)
Charges against allowance	(521)	(53)	0
Ending balance	$ 0	$ 656	$ 357

Subsequent Events - Narrative (Details) - Subsequent Event			3 Months Ended
	May 22, 2017 $ / shares	Apr. 06, 2017 USD ($) financial_institutions interest_rate_swap	Jun. 30, 2017 USD ($) shares	Apr. 25, 2017 USD ($)
Subsequent Event [Line Items]
Stock repurchased during period, value			$ 9,900,000
Stock repurchased during period, shares \| shares			279,600
Dividends payable, date declared	May 22, 2017
Dividends payable, amount (in usd per share) \| $ / shares	$ 0.17
Dividends payable, date to be paid	Jun. 30, 2017
Dividends payable, date of record	Jun. 10, 2017
Interest Rate Swap
Subsequent Event [Line Items]
Number of interest rate derivatives held \| interest_rate_swap		3
Number of different financial institutions entered into agreement with \| financial_institutions		3
Notional amount		$ 100,000,000
London Interbank Offered Rate (LIBOR) \| Interest Rate Swap
Subsequent Event [Line Items]
Basis spread on variable rate		1.998%
5.125% Senior Notes Due 2025 \| Senior Notes
Subsequent Event [Line Items]
Aggregate principal amount				$ 350,000,000
Debt Instrument, Interest Rate, Stated Percentage				5.125%