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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	6 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Policyholders Account In Life Insurance Business [Abstract]
Reinsurance benefits	¥ 9,170	¥ 969
Reinsurance premiums	¥ (2,593)	¥ (2,438)

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- Definition

Policyholders Account In Life Insurance Business [Abstract]

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No definition available.

+ Details

Name:	ck0001070304_PolicyholdersAccountInLifeInsuranceBusinessAbstract
Namespace Prefix:	ck0001070304_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

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

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No definition available.

+ Details

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

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- Definition

Premiums paid for reinsurance contracts ceded to other reinsurance companies.

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No definition available.

+ Details

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