Document and Entity Information
3 Months Ended
Jun. 30, 2014
Jul. 25, 2014
Common stock, Class A
Jul. 25, 2014
Non-voting common stock, Class B
Jul. 25, 2014
Restricted common stock, Class C
Jul. 25, 2014
Special voting common stock, Class E
Document and Entity Information [Abstract]          
Entity Registrant Name Booz Allen Hamilton Holding Corp        
Entity Central Index Key 0001443646        
Document Type 10-Q        
Document Period End Date Jun. 30, 2014        
Amendment Flag false        
Document Fiscal Year Focus 2015        
Document Fiscal Period Focus Q1        
Current Fiscal Year End Date --03-31        
Entity Filer Category Accelerated Filer        
Entity Listings [Line Items]          
Entity Common Stock, Shares Outstanding   144,597,154 525,370 914,101 4,419,184