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Schedule II.-Valuation and Qualifying Accounts and Reserves (Parenthetical) (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Valuation allowance reserves and benefits recognized in earnings	¥ 3,660	¥ 1,465	¥ 1,742

X

- Definition

Valuation allowance reserves and benefits recognized in earnings.

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

Name:	srt_ValuationAndQualifyingAccountsAbstract
Namespace Prefix:	srt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration