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Stock-Based Compensation - Additional Information (Detail) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2024 JPY (¥) Point | Mar. 31, 2023 JPY (¥) | Mar. 31, 2022 JPY (¥)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Points settled for individuals retired | 73,180 |  |
Points outstanding | 2,732,318 |  |
Stock Compensation Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Points granted | 531,542 |  |
Stock-based compensation costs recognized | ¥ | ¥ 2,177 | ¥ 937 | ¥ 1,191

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