v3.3.1.900
Document and Entity Information - shares
9 Months Ended
Dec. 31, 2015
Jan. 25, 2016
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 Dec. 31, 2015  
Amendment Flag false  
Document Fiscal Year Focus 2016  
Document Fiscal Period Focus Q3  
Current Fiscal Year End Date --03-31  
Entity Filer Category Large Accelerated Filer  
Common stock, Class A    
Entity Listings [Line Items]    
Entity Common Stock, Shares Outstanding   148,788,170
Non-voting common stock, Class B    
Entity Listings [Line Items]    
Entity Common Stock, Shares Outstanding   0
Restricted common stock, Class C    
Entity Listings [Line Items]    
Entity Common Stock, Shares Outstanding   0
Special voting common stock, Class E    
Entity Listings [Line Items]    
Entity Common Stock, Shares Outstanding   0