Commitments - Schedule of Significant Commitments for Purchase of Goods and Services (Details) - JPY (¥) ¥ in Millions |
Mar. 31, 2026 |
Mar. 31, 2025 |
|---|---|---|
| Commitments [Abstract] | ||
| Purchase contracts for services | ¥ 25,175 | ¥ 3,738 |
| Intangible assets | 515 | 1,138 |
| Property and equipment | 494 | 192 |
| Total | ¥ 26,184 | ¥ 5,068 |