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Equity - Narrative (Details) - JPY (¥) |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 10, 2025 | Mar. 31, 2026 | Mar. 31, 2025 | Dec. 10, 2024 | Mar. 31, 2024
Disclosure of classes of share capital [line items] |  |  |  |  |
Authorised share capital |  | ¥ 4,000,000 |  |  |
Authorised share capital (in shares) |  | 400,000,000 |  |  |
Nominal value |  | ¥ 0.01 |  |  |
Shares outstanding (in shares) |  | 163,077,538 | 130,814,526 | 129,703,075 | 122,587,617
Non-redemption premium paid | ¥ 1,593,000,000 |  |  |  |
Equity distribution and subsequent cash receipts as equity contributions |  | ¥ 202,000,000 |  |  |
Non-Redemption Shares |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of non-redemption shares (in shares) | 973,000 |  |  |  |
Shares outstanding (in shares) |  | 854,242 |  |  |

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