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Cash Flow Information - Additional Information (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
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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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