Reverse Recapitalization and Acquisitions of subsidiaries - Goodwill (Details) - JPY (¥) ¥ in Millions |
Mar. 31, 2026 |
Oct. 14, 2025 |
Mar. 14, 2025 |
Mar. 10, 2025 |
|---|---|---|---|---|
| Disclosure of detailed information about business combination [line items] | ||||
| Total fair value of consideration | ¥ 17,423 | |||
| Next Finance Tech Co, Ltd. | ||||
| Disclosure of detailed information about business combination [line items] | ||||
| Net assets (liabilities) of Thunder Bridge as of December 10, 2024 | ¥ 225 | ¥ 225 | ||
| Goodwill arising on acquisition | 1,117 | |||
| Total fair value of consideration | ¥ 1,342 | ¥ 1,342 | ||
| Aplo SAS | ||||
| Disclosure of detailed information about business combination [line items] | ||||
| Net assets (liabilities) of Thunder Bridge as of December 10, 2024 | ¥ 1,865 | |||
| Goodwill arising on acquisition | 1,566 | |||
| Total fair value of consideration | ¥ 3,431 |