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Deferred taxes and incomes tax expenses (benefits) - Narrative (Details) - JPY (¥) ¥ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2027 | Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2024
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Tax effect of tax losses |  | ¥ 2,512 | ¥ 3,180 |
Unused tax losses for which no deferred tax asset recognised |  | ¥ 5,692 |  |
Tax rate effect of foreign tax rates |  | 30.60% | 30.60% | 30.60%
Statutory effective tax rate |  | 25.80% | 25.80% | 30.60%
Current-year losses for which no deferred tax asset is recognized |  | (26.00%) | (6.00%) | 0.00%
Rcognized Loss Before Income Taxes, Coincheck Parent and Aplo |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Current-year losses for which no deferred tax asset is recognized |  | 25.00% |  |
Changes in tax rates or tax laws enacted or announced |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Tax rate effect of foreign tax rates | 31.50% |  |  |
Next Finance Tech Co, Ltd. |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Unused tax losses for which no deferred tax asset recognised |  | ¥ 113 | ¥ 154 |
Aplo SAS |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Unused tax losses for which no deferred tax asset recognised |  | ¥ 2,180 |  |

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- Definition The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to tax losses. [Refer: Accounting profit] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2025-01-01 -Paragraph 81 -Subparagraph c -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2025-en-r&anchor=para_81_c_i&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 194 -Subparagraph c -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_194_c_i&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 194 -Subparagraph c -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_194_c_i&doctype=Standard -URIDate 2025-03-27 + Details
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