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Commitments, Guarantees and Contingent Liabilities (Amounts Due of Certain Computer Systems Operated and Maintained under Non-cancelable Contracts with Third-party Service Providers) (Detail) - JPY (¥) ¥ in Millions | Sep. 30, 2023 | Mar. 31, 2023
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Commitments and Contingencies Disclosure [Abstract] |  |
Within one year | ¥ 5,919 | ¥ 5,846
More than one year | 8,511 | 8,353
Total | ¥ 14,430 | ¥ 14,199

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- Definition Contractual commitments future minimum payments due. + References No definition available. + Details
Name: | ck0001070304_ContractualCommitmentsFutureMinimumPaymentsDue
Namespace Prefix: | ck0001070304_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contractual commitments future minimum payments due current. + References No definition available. + Details
Name: | ck0001070304_ContractualCommitmentsFutureMinimumPaymentsDueCurrent
Namespace Prefix: | ck0001070304_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contractual commitments future minimum payments due thereafter. + References No definition available. + Details
Name: | ck0001070304_ContractualCommitmentsFutureMinimumPaymentsDueThereafter
Namespace Prefix: | ck0001070304_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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