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Cash Flow Information - Additional Information (Detail) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Schedule of Cash Flow, Supplemental [Line Items]
Real estate under operating leases transferred from installment loans as a result of real estate collateral acquired from non-recourse loans	¥ 750	¥ 464	¥ 75
Other assets transferred from installment loans as a result of real estate collateral acquired from non-recourse loans	12	6	1
Assets decreased due to deconsolidation of VIEs	7,752	13,378	5,218
Liabilities decreased due to deconsolidation of VIEs	¥ 3,916	¥ 943	¥ 18

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Value transferred out of other assets in noncash transactions.

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Value transferred out of real estate owned (REO) in noncash transactions.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 230
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