Earnings Per Share - Summary of Earnings Per Share (Detail) - JPY (¥) ¥ / shares in Units, shares in Thousands, ¥ in Millions |
12 Months Ended | ||||
|---|---|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
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| Basic: | |||||
| Profit attributable to shareholders of the Company | ¥ 1,137,557 | ¥ 478,132 | ¥ 873,346 | ||
| Weighted average number of common stock in issue (in thousands of shares) | 3,842,444 | 3,906,456 | 3,987,077 | ||
| Basic earnings per share | [1] | ¥ 296.05 | ¥ 122.4 | ¥ 219.04 | |
| Diluted: | |||||
| Profit attributable to the common shareholders of the Company | ¥ 1,137,557 | ¥ 478,132 | ¥ 873,346 | ||
| Impact of dilutive potential ordinary shares issued by subsidiaries and associates | (11) | (6) | 0 | ||
| Net profit used to determine diluted earnings per share | ¥ 1,137,546 | ¥ 478,126 | ¥ 873,346 | ||
| Weighted average number of common stock in issue (in thousands of shares) | 3,842,444 | 3,906,456 | 3,987,077 | ||
| Adjustments for stock options (in thousands of shares) | 766 | 939 | 1,160 | ||
| Weighted average number of common stock for diluted earnings per share (in thousands of shares) | 3,843,210 | 3,907,395 | 3,988,237 | ||
| Diluted earnings per share | [1] | ¥ 295.99 | ¥ 122.36 | ¥ 218.98 | |
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