v2.4.0.6
Document and Entity Information (USD $)
12 Months Ended
Mar. 31, 2013
Sep. 30, 2012
May 14, 2013
Common stock, Class A
May 14, 2013
Non-voting common stock, Class B
May 14, 2013
Restricted common stock, Class C
May 14, 2013
Special voting common stock, Class E
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, 2013          
Amendment Flag false          
Document Fiscal Year Focus 2013          
Document Fiscal Period Focus Q4          
Current Fiscal Year End Date --03-31          
Entity Filer Category Accelerated Filer          
Entity Well-known Seasoned Issuer No          
Entity Voluntary Filers No          
Entity Current Reporting Status Yes          
Entity Public Float   $ 500,465,332        
Entity Common Stock, Shares Outstanding     136,350,016 1,447,600 1,224,319 7,478,522