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Investment in Affiliates - Additional Information (Detail) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Schedule of Equity Method Investments [Line Items] |  |  |
Investment in affiliates, aggregate investment | ¥ 148,045 | ¥ 166,492 |
Investment in affiliates, market value | 196,793 | 223,834 |
Investment in affiliates, dividends received | 21,072 | 17,759 | ¥ 15,416
Investment in affiliates over underlying equity in net assets | ¥ 112,977 | ¥ 135,897 |
Avolon Holdings |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 30.00% | 30.00% |
Kansai Airports |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 40.00% | 40.00% |

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