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Transfer of Financial Assets - Fair Value of Servicing Assets (Detail) - JPY (¥) ¥ in Millions	Sep. 30, 2025	Mar. 31, 2025
Transfers and Servicing [Abstract]
Beginning balance	¥ 116,745	¥ 122,641
Ending balance	¥ 118,126	¥ 116,745

X

- Definition

Servicing Asset At Amortized Cost Fair Value

+ References

No definition available.

+ Details

Name:	ck0001070304_ServicingAssetAtAmortizedCostFairValue
Namespace Prefix:	ck0001070304_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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