v3.19.3.a.u2
Cover - shares
9 Months Ended
Dec. 31, 2019
Jan. 28, 2020
Cover page.    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Dec. 31, 2019  
Document Transition Report false  
Entity File Number 001-34972  
Entity Registrant Name Booz Allen Hamilton Holding Corp  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 26-2634160  
Entity Address, Address Line One 8283 Greensboro Drive,  
Entity Address, City or Town McLean,  
Entity Address, State or Province VA  
Entity Address, Postal Zip Code 22102  
City Area Code 703  
Local Phone Number 902-5000  
Title of 12(b) Security Class A Common Stock  
Trading Symbol BAH  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   140,214,612
Current Fiscal Year End Date --03-31  
Entity Central Index Key 0001443646  
Amendment Flag false  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q3