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Income and Expenses Relating to Life Insurance Operations - Reinsurance Benefits and Reinsurance Premiums Included in Life Insurance Premiums (Detail) - JPY (¥) ¥ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Insurance [Abstract]
Reinsurance benefits	¥ 666	¥ 344	¥ 1,277	¥ 657
Reinsurance premiums	¥ (1,203)	¥ (1,199)	¥ (2,373)	¥ (2,390)

X

- Definition

Revenues from premiums earned on the income statement for reinsurance contracts assumed from other insurers.

+ References

No definition available.

+ Details

Name:	ck0001070304_ReinsuranceBenefits
Namespace Prefix:	ck0001070304_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Premiums paid for reinsurance contracts ceded to other reinsurance companies.

+ References

No definition available.

+ Details

Name:	ck0001070304_ReinsurancePremiums
Namespace Prefix:	ck0001070304_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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