Income Tax - Reconciliation of Statutory Effective Tax Rate and the Actual Effective Tax Rate (Details) |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Income Tax [Abstract] | |||
| Japanese statutory effective tax rate | 31.46% | 31.46% | 31.46% |
| Permanent non-deductible items | (0.05%) | (0.46%) | 877.15% |
| Assessment of the recoverability of deferred tax assets | (79.80%) | (41.39%) | 10522.38% |
| Additional taxable profit | 0.46% | 1.23% | 341.31% |
| Change in tax rate | 0.83% | (3.37%) | 1441.10% |
| Tax credits | (0.65%) | (0.92%) | (2773.17%) |
| Share of loss of investments accounted for using the equity method | 0.05% | 0.49% | 0.00% |
| Tax rate difference between subsidiaries | 0.30% | 0.58% | (989.88%) |
| Other | 0.04% | 0.38% | (2004.09%) |
| Actual effective tax rate | (47.36%) | (12.00%) | 7446.26% |