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Write-Downs of Long-Lived Assets - Additional Information (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Property, Plant and Equipment [Abstract]
Write-downs of long-lived assets	¥ 25,933	¥ 1,724	¥ 2,297

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