Reverse Recapitalization and Acquisitions of subsidiaries - Reconciliation of total market capitalization (Details) - JPY (¥) ¥ in Millions |
12 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Business Combinations And Reverse Recapitalization [Abstract] | ||
| Total market capitalization attributable to Thunder Bridge stockholders | ¥ 13,165 | |
| Less: Ghisallo Non-Redemption Agreement | (1,593) | ¥ (1,593) |
| Less: Additional paid-in capital transferred over when transferring net liabilities from CCG, under common control | (189) | |
| Less: Ordinary Shares | (15) | |
| Plus: Treasury shares | 4 | |
| Additional paid-in capital from Reverse Recapitalization, net | ¥ 11,372 | |