Related-Party Transactions - Compensation Expenses of Key Management Personnel (Detail) - JPY (¥) ¥ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Disclosure of transactions between related parties [abstract] | |||
| Short-term employee benefits | ¥ 1,511 | ¥ 1,450 | ¥ 1,693 |
| Share-based compensation | ¥ 752 | ¥ 615 | ¥ 868 |