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v3.25.3

Transfer of Financial Assets - Fair Value of Servicing Assets (Detail) - JPY (¥) ¥ in Millions | Sep. 30, 2025 | Mar. 31, 2025
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Transfers and Servicing [Abstract] |  |
Beginning balance | ¥ 116,745 | ¥ 122,641
Ending balance | ¥ 118,126 | ¥ 116,745

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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