Cash Flow Information - Additional Information (Detail) - JPY (¥) ¥ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| 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 | ¥ 16,903 | ¥ 12,494 | ¥ 9,442 |
| Other assets transferred from installment loans as a result of real estate collateral acquired from non-recourse loans | 2 | 29 | |
| Assets decreased due to deconsolidation of VIEs | 1,255 | 3,201 | 1,777 |
| Liabilities decreased due to deconsolidation of VIEs | 296 | 1,051 | 0 |
| Investment in securities transferred from installment loans as a result of restructuring | 1,129 | ¥ 311 | ¥ 3,452 |
| Convertible Bonds Received For Equity Method Investment Sale | 107,208 | ||
| Real estate recognized from VIE consolidation | ¥ 15,619 | ||