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Summary of Significant Accounting Policies - Investments in Variable Interest Entities and Other Investments (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Mar. 31, 2024
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Accounting Policies [Abstract] |  |
Variable interest entities and other investments | $ 90 | $ 42

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- Definition Variable Interest Entities and Other Investments + References No definition available. + Details
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Namespace Prefix: | bah_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration