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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