Property, Plant and Equipment - Schedule of Expenses Related to Leases Not Included in the Measurement of the Lease Liabilities (Details) - JPY (¥) ¥ in Millions |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Disclosure of detailed information about property, plant and equipment [abstract] | |||
| Expense relating to short-term leases | ¥ 3,624 | ¥ 4,160 | ¥ 4,312 |
| Expense relating to leases of low-value assets that are not short-term leases expenses | 454 | 493 | 887 |
| Expense relating to variable lease payments | 12,263 | 11,250 | 10,954 |
| Total expenses not included in lease liabilities | ¥ 16,341 | ¥ 15,904 | ¥ 16,152 |