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Investment in Securities (Summary of Roll-forward of Allowance for Credit Losses) (Parenthetical) (Detail) ¥ in Millions	12 Months Ended
	Mar. 31, 2021 JPY (¥)
Investments, Debt and Equity Securities [Abstract]
Increase from the effects of changes in foreign exchange rates	¥ 3

X

- Definition

Debt Securities, Available-for-sale, Allowance for credit loss effects of changes in foreign exchange rates.

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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