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Schedule II.-Valuation and Qualifying Accounts and Reserves (Parenthetical) (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |  |  |
Valuation allowance reserves and benefits recognized in earnings | ¥ 3,380 | ¥ 3,660 | ¥ 1,465
Remaining valuation allowance reserves and benefits recognized in earnings | ¥ 3,128 | ¥ 3,613 | ¥ 125

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- Definition Remaining valuation allowance reserves and benefits recognized in earnings. + References No definition available. + Details
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- Definition Valuation allowance reserves and benefits recognized in earnings. + References No definition available. + Details
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Namespace Prefix: | ck0001070304_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- References No definition available. + Details
Name: | srt_ValuationAndQualifyingAccountsAbstract
Namespace Prefix: | srt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration