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Lease Income (Parenthetical) (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Lessor, Lease, Description [Line Items] |  |  |
Gain (loss) on sale of leased assets, net, operating leases | ¥ 76,633 | ¥ 53,441 | ¥ 56,932
Real estate asset [member] |  |  |
Lessor, Lease, Description [Line Items] |  |  |
Gain (loss) on sale of leased assets, net, operating leases | 31,965 | 20,960 | 25,699
Operating lease assets other than real estate [member] |  |  |
Lessor, Lease, Description [Line Items] |  |  |
Gain (loss) on sale of leased assets, net, operating leases | ¥ 44,668 | ¥ 32,481 | ¥ 31,233

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