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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	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Policyholders Account In Life Insurance Business [Abstract]
Reinsurance benefits	¥ 10,634	¥ 3,452	¥ 3,239
Reinsurance premiums	¥ (5,119)	¥ (4,937)	¥ (4,891)

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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.

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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