Earnings Per Share - Additional Information (Detail) |
12 Months Ended | ||||||
|---|---|---|---|---|---|---|---|
May 13, 2026 |
May 15, 2024 |
Mar. 31, 2026
¥ / shares
|
Mar. 31, 2025
¥ / shares
|
Mar. 31, 2024
¥ / shares
|
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| Earnings per share [line items] | |||||||
| Basic earnings per share | [1] | ¥ 296.05 | ¥ 122.4 | ¥ 219.04 | |||
| Diluted earnings per share | [1] | 295.99 | ¥ 122.36 | ¥ 218.98 | |||
| 2026 Stock Split [Member] | |||||||
| Earnings per share [line items] | |||||||
| Basic earnings per share | 148.03 | ||||||
| Diluted earnings per share | ¥ 147.99 | ||||||
| Major ordinary share transactions [member] | |||||||
| Earnings per share [line items] | |||||||
| Stockholder equity stock split ratio | 2 | 3 | |||||
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