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Write-Downs of Long-Lived Assets - Additional Information (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Property, Plant and Equipment [Abstract] |  |  |
Write-downs of long-lived assets | ¥ 1,724 | ¥ 2,297 | ¥ 35,666

X
- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of long-lived assets to fair value. + References No definition available. + Details
Name: | ck0001070304_ImpairmentOfWriteDownOfLongLivedAssets
Namespace Prefix: | ck0001070304_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration