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Short-Term and Long-Term Debt (Assets Provided as Collateral for Short-Term and Long-Term Debt Payables to Financial Institutions) (Detail) - JPY (¥) ¥ in Millions	Mar. 31, 2023	Mar. 31, 2022
Debt Instrument [Line Items]
Investment in securities	¥ 2,940,858	¥ 2,852,349
Property under facility operations	620,994	¥ 561,846
Asset Pledged as Collateral [Member]
Debt Instrument [Line Items]
Lease payments, loans and investment in operating leases	148,057
Investment in securities	183,441
Property under facility operations	130,191
Other assets and other	110,159
Total	¥ 571,848

X

- Definition

Investment in securities.

+ References

No definition available.

+ Details

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

X

- Definition

Lease payments, loans and investment in operating leases.

+ References

No definition available.

+ Details

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

X

- Definition

Other assets and other.

+ References

No definition available.

+ Details

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

X

- Definition

Pledged Assets, Other, Not Separately Reported on Statement of Financial Position.

+ References

No definition available.

+ Details

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

X

- Definition

Property under Facility Operations

+ References

No definition available.

+ Details

Name:	ck0001070304_PropertyUnderFacilityOperations
Namespace Prefix:	ck0001070304_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: