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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) ¥ in Millions | Mar. 31, 2023 JPY (¥)
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Commitments and Contingencies Disclosure [Abstract] |
2024 | ¥ 5,846
2025 | 4,263
2026 | 1,663
2027 | 1,468
2028 | 958
Thereafter | 1
Total | ¥ 14,199

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

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- Definition Contractual commitments future minimum payments due in five years. + References No definition available. + Details
Name: | ck0001070304_ContractualCommitmentsFutureMinimumPaymentsDueInFiveYears
Namespace Prefix: | ck0001070304_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contractual commitments future minimum payments due in four years. + References No definition available. + Details
Name: | ck0001070304_ContractualCommitmentsFutureMinimumPaymentsDueInFourYears
Namespace Prefix: | ck0001070304_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual commitments future minimum payments due in three years. + References No definition available. + Details
Name: | ck0001070304_ContractualCommitmentsFutureMinimumPaymentsDueInThreeYears
Namespace Prefix: | ck0001070304_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual commitments future minimum payments due in two years. + References No definition available. + Details
Name: | ck0001070304_ContractualCommitmentsFutureMinimumPaymentsDueInTwoYears
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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration