v2.4.0.8
Document and Entity Information (USD $)
12 Months Ended
Mar. 31, 2015
Sep. 30, 2014
May 15, 2015
Common stock, Class A
May 15, 2015
Non-voting common stock, Class B
May 15, 2015
Restricted common stock, Class C
May 15, 2015
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, 2015          
Amendment Flag false          
Document Fiscal Year Focus 2015          
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   $ 1,851,829,177        
Entity Common Stock, Shares Outstanding     147,236,512 0 0 1,851,590