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Cover - USD ($)
 12 Months Ended
Mar. 31, 2025
May 20, 2025
Sep. 30, 2024
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Mar. 31, 2025    
Current Fiscal Year End Date --03-31    
Document Transition Report false    
Entity File Number 001-34972    
Entity Registrant Name Booz Allen Hamilton Holding Corporation    
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 Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
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    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 20,650,914,907
Entity Common Stock, Shares Outstanding   124,187,634  
Documents Incorporated by Reference
Portions of the registrant’s Proxy Statement for its Annual Meeting of Stockholders scheduled for July 23, 2025 are incorporated by reference into Part III.
    
Entity Central Index Key 0001443646    
Amendment Flag false    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Document Financial Statement Error Correction [Flag] false