Earnings per Share - Additional Information (Detail) - shares |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Earnings Per Share [Abstract] | |||
| Weighted average shares outstanding – basic | 21 | 26.2 | 34 |
| Common stock, shares held in employee trust, shares | 37,700,000 | 14,600,000 | 22,900,000 |