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Cash Flow Information - Additional Information (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
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 | ¥ 12,494 | ¥ 9,442 | ¥ 750
Other assets transferred from installment loans as a result of real estate collateral acquired from non-recourse loans | 2 | 29 | 12
Assets decreased due to deconsolidation of VIEs | 3,201 | 1,777 | 7,752
Liabilities decreased due to deconsolidation of VIEs | 1,051 | 0 | ¥ 3,916
Investment in securities transferred from installment loans as a result of restructuring | ¥ 311 | ¥ 3,452 |

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