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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, 2025	Mar. 31, 2025
Commitments and Contingencies Disclosure [Abstract]
Within one year	¥ 5,812	¥ 5,809
More than one year	6,113	7,660
Total	¥ 11,925	¥ 13,469

X

- Definition

Contractual commitments future minimum payments due.

+ References

No definition available.

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X

- 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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X

- Definition

Contractual commitments future minimum payments due thereafter.

+ References

No definition available.

+ Details

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Namespace Prefix:	ck0001070304_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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