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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
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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] + References 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. + References 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. + References No definition available. + Details
Name: | ck0001070304_ReinsurancePremiums
Namespace Prefix: | ck0001070304_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration