Schedule II.-Valuation and Qualifying Accounts and Reserves (Parenthetical) (Detail) - JPY (¥) ¥ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] | |||
| Valuation allowance reserves and benefits recognized in earnings | ¥ 1,877 | ¥ 3,380 | ¥ 3,660 |
| Remaining valuation allowance reserves and benefits recognized in earnings | ¥ 812 | ¥ 3,128 | ¥ 3,613 |