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Equity - Schedule of shares outstanding (Details) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Changes in number of shares outstanding [abstract] |  |
Number of shares issued (in shares) | 130,814,526 | 122,587,617
Number of shares outstanding at beginning of period (in shares) | 130,814,526 | 122,587,617
Issued capital, ordinary shares | ¥ 213 | ¥ 196
Issuance of new shares | ¥ 20,827 | ¥ 1,076
Number of shares issued (in shares) | 163,077,538 | 130,814,526
Number of shares outstanding at end of period (in shares) | 163,077,538 | 130,814,526
Issued capital, ordinary shares | ¥ 273 | ¥ 213
Issuance of shares in Reverse Recapitalization |  |
Changes in number of shares outstanding [abstract] |  |
Increase (decrease) in number of shares outstanding | 0 | 7,115,459
Increase (decrease) in number of ordinary shares issued | 0 | 7,115,459
Issuance of new shares | ¥ 0 | ¥ 15
Issuance of shares in business acquisition | Next Finance Tech Co, Ltd. |  |
Changes in number of shares outstanding [abstract] |  |
Increase (decrease) in number of shares outstanding | 0 | 1,111,450
Increase (decrease) in number of ordinary shares issued | 0 | 1,111,450
Issuance of new shares | ¥ 0 | ¥ 2
Issuance of shares in business acquisition | Aplo SAS |  |
Changes in number of shares outstanding [abstract] |  |
Increase (decrease) in number of shares outstanding | 5,007,500 | 0
Increase (decrease) in number of ordinary shares issued | 5,007,500 | 0
Issuance of new shares | ¥ 9 | ¥ 0
Issuance of shares in business acquisition | 3iQ Corp |  |
Changes in number of shares outstanding [abstract] |  |
Increase (decrease) in number of shares outstanding | 27,910,845 | 0
Increase (decrease) in number of ordinary shares issued | 27,910,845 | 0
Issuance of new shares | ¥ 51 | ¥ 0
Issuance of shares for restricted share units |  |
Changes in number of shares outstanding [abstract] |  |
Increase (decrease) in number of shares outstanding | 198,909 | 0
Increase (decrease) in number of ordinary shares issued | 198,909 | 0
Issuance of new shares | ¥ 0 | ¥ 0
Non-Redemption shares returned to Coincheck Parent |  |
Changes in number of shares outstanding [abstract] |  |
Increase (decrease) in number of shares outstanding | (854,242) | 0
Increase (decrease) in number of ordinary shares issued | (854,242) | 0
Issuance of new shares | ¥ 0 | ¥ 0

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