v2.4.0.6
Document and Entity Information (USD $)
12 Months Ended
Mar. 31, 2012
Sep. 30, 2011
May 18, 2011
Class A Common Stock
May 18, 2011
Class B Non-Voting Common Stock
May 18, 2011
Class C Restricted Common Stock
May 18, 2011
Class E Special Voting Common Stock
Entity Registrant Name Booz Allen Hamilton Holding Corp          
Entity Central Index Key 0001443646          
Document Type 10-K          
Document Period End Date Mar. 31, 2012          
Amendment Flag false          
Document Fiscal Year Focus 2012          
Document Fiscal Period Focus FY          
Current Fiscal Year End Date --03-31          
Entity Well-known Seasoned Issuer No          
Entity Voluntary Filers No          
Entity Current Reporting Status Yes          
Entity Filer Category Accelerated Filer          
Entity Public Float   $ 432,268,580        
Entity Common Stock, Shares Outstanding     128,417,006 2,470,825 1,533,020 10,140,067