Critical Accounting Judgments and Key Sources of Estimation Uncertainty - Additional Information (Details) - JPY (¥) |
12 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
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| Critical accounting judgments and key sources of estimation uncertainty [abstract] | ||
| Impairment loss | ¥ 0 | ¥ 0 |