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Transfer of Financial Assets - Fair Value of Servicing Assets (Detail) - JPY (¥) ¥ in Millions | Mar. 31, 2024 | Mar. 31, 2023
--- | --- | ---
Transfers and Servicing [Abstract] |  |
Beginning balance | ¥ 101,375 | ¥ 83,732
Ending balance | ¥ 122,641 | ¥ 101,375

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- Definition Servicing Asset At Amortized Cost Fair Value + References No definition available. + Details
Name: | ck0001070304_ServicingAssetAtAmortizedCostFairValue
Namespace Prefix: | ck0001070304_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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