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Lease Income (Operating Lease) (Parenthetical) (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Lessor, Lease, Description [Line Items] |  |  |
Gains on sales of operating lease assets | ¥ 53,441 | ¥ 56,932 | ¥ 40,148
Real Estate Asset |  |  |
Lessor, Lease, Description [Line Items] |  |  |
Gains on sales of operating lease assets | 20,960 | 25,699 | 17,912
Operating Lease Assets Other than Real Estate |  |  |
Lessor, Lease, Description [Line Items] |  |  |
Gains on sales of operating lease assets | ¥ 32,481 | ¥ 31,233 | ¥ 22,236

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