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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 | Mar. 31, 2024 | Mar. 31, 2023
--- | --- | ---
Commitments and Contingencies Disclosure [Abstract] |  |
2024 |  | ¥ 5,846
2025 | ¥ 6,218 | 4,263
2026 | 3,462 | 1,663
2027 | 2,735 | 1,468
2028 | 1,704 | 958
2029 | 52 |
On or after 2029 |  | 1
On or after 2030 | 1 |
Total | ¥ 14,172 | ¥ 14,199

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- Definition Contractual commitments future minimum payments due. + References No definition available. + Details
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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
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- Definition Contractual commitments future minimum payments due in five years. + 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 four years. + References No definition available. + Details
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Namespace Prefix: | ck0001070304_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Contractual Commitments Future Minimum Payments Due In Six Years. + 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 three years. + 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 two years. + 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 thereafter eight years. + 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 thereafter seven years. + 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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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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