Acquisitions and Divestitures	12 Months Ended
Acquisitions and Divestitures	Mar. 31, 2025
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Acquisitions and Divestitures	Acquisitions and Divestitures Acquisitions Everwatch Corp. On October 14, 2022, the Company completed the acquisition of EverWatch Corp. (“EverWatch”), a leading provider of advanced solutions to the defense and intelligence communities for approximately $445 million, net of post-closing adjustments and also incurred transaction costs as part of the acquisition. The acquisition was funded with cash on hand and was accounted for under the acquisition method of accounting. As a result of the transaction, EverWatch became a wholly owned subsidiary of Booz Allen Hamilton Inc. The Company recognized $109 million of intangible assets which consists primarily of contract assets and were valued using the excess earnings method discounted cash flow approach, incorporating Level 3 inputs as described under the fair value hierarchy of Topic 820. These unobservable inputs reflect the Company's own judgment about which assumptions market participants would use in pricing an asset on a non-recurring basis. The intangible assets will be amortized over the estimated useful life of fourteen years. The goodwill of $331 million is primarily attributable to EverWatch's specialized workforce and the expected synergies between the Company and EverWatch, and is non-deductible for tax purposes. PAR Government Systems Corporation On June 7, 2024, the Company completed the acquisition of PAR Government Systems Corporation (“PGSC”), previously a wholly owned subsidiary of PAR Technology Corporation, for approximately $99 million, net of post-closing adjustments and incurred transaction costs as part of the acquisition. PGSC was founded in 1985 and headquartered in Rome, New York, and delivers differentiated services and solutions in strategic mission areas, including the provision of real-time communications and mobile situational awareness to maintain battlespace dominance for a range of government customers. The acquisition was funded with cash on hand. As a result of the transaction, PGSC became a wholly owned subsidiary of Booz Allen Hamilton Inc. The acquisition was accounted for under the acquisition method of accounting. The Company completed the determination of fair values of the acquired assets and liabilities assumed during the fourth quarter of fiscal 2025. The goodwill recognized of $61 million is primarily attributable to PGSC’s specialized workforce and the expected synergies between the Company and PGSC, and is deductible for tax purposes. The intangible assets recognized of $27 million consist primarily of contract assets and are being amortized over the estimated useful life of twelve years. Divestitures Middle East and North Africa Management Consulting Business On September 1, 2022, the Company completed the divestiture of its management consulting business serving the Middle East and North Africa (“MENA”) region to Oliver Wyman, a global management consulting firm and a business of Marsh McLennan. The divestiture was substantially comprised of the contracts associated with the MENA business, the assets and liabilities associated with those contracts, and the workforce that provides services under those contracts. As a result of this transaction, the Company de-recognized the assets and liabilities associated with the MENA business and recognized a pre-tax gain of $31 million in the second quarter of fiscal 2023, which is reflected in other income (expense), net, on the consolidated statement of operations.