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Deferred taxes and incomes tax expenses (benefits) - Deferred tax assets and deferred liabilities (Details) - JPY (¥) ¥ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2024
Incomes Taxes [Abstract] |  |  |  |
Deferred tax assets |  | ¥ 378 | ¥ 337 |
Deferred tax liabilities | [1] | 562 | 79 |
Deferred tax liability (asset) |  | 185 | (258) |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax assets |  | 378 | 337 |
Deferred tax liabilities | [1] | 562 | 79 |
Deferred tax liability (asset) |  | 185 | (258) |
Deferred tax assets |  |  |  |
Incomes Taxes [Abstract] |  |  |  |
Deferred tax assets |  | 793 | 836 | ¥ 857
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax assets |  | 793 | 836 | 857
Recognized through profit or loss |  | (95) | (20) |
Addition (business combination) |  | 53 | 0 |
Deferred tax assets | Lease liabilities |  |  |  |
Incomes Taxes [Abstract] |  |  |  |
Deferred tax assets |  | 292 | 425 | 522
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax assets |  | 292 | 425 | 522
Recognized through profit or loss |  | (133) | (97) |
Addition (business combination) |  | 0 | 0 |
Deferred tax assets | Tax losses carried forward(1) |  |  |  |
Incomes Taxes [Abstract] |  |  |  |
Deferred tax assets |  | 36 | 0 | 26
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax assets |  | 36 | 0 | 26
Recognized through profit or loss |  | (16) | (26) |
Addition (business combination) |  | 53 | 0 |
Deferred tax assets | Accrued enterprise tax |  |  |  |
Incomes Taxes [Abstract] |  |  |  |
Deferred tax assets |  | 37 | 49 | 36
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax assets |  | 37 | 49 | 36
Recognized through profit or loss |  | (12) | 13 |
Addition (business combination) |  | 0 | 0 |
Deferred tax assets | Accrued bonuses |  |  |  |
Incomes Taxes [Abstract] |  |  |  |
Deferred tax assets |  | 66 | 98 | 71
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax assets |  | 66 | 98 | 71
Recognized through profit or loss |  | (32) | 27 |
Addition (business combination) |  | 0 | 0 |
Deferred tax assets | Accrued expenses |  |  |  |
Incomes Taxes [Abstract] |  |  |  |
Deferred tax assets |  | 18 | 76 | 98
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax assets |  | 18 | 76 | 98
Recognized through profit or loss |  | (58) | (22) |
Addition (business combination) |  | 0 | 0 |
Deferred tax assets | Accrued paid leaves |  |  |  |
Incomes Taxes [Abstract] |  |  |  |
Deferred tax assets |  | 24 | 16 | 16
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax assets |  | 24 | 16 | 16
Recognized through profit or loss |  | 8 | 0 |
Addition (business combination) |  | 0 | 0 |
Deferred tax assets | Leasehold improvements |  |  |  |
Incomes Taxes [Abstract] |  |  |  |
Deferred tax assets |  | 65 | 36 | 19
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax assets |  | 65 | 36 | 19
Recognized through profit or loss |  | 28 | 17 |
Addition (business combination) |  | 0 | 0 |
Deferred tax assets | Asset retirement obligations |  |  |  |
Incomes Taxes [Abstract] |  |  |  |
Deferred tax assets |  | 104 | 107 | 37
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax assets |  | 104 | 107 | 37
Recognized through profit or loss |  | (2) | 70 |
Addition (business combination) |  | 0 | 0 |
Deferred tax assets | Other |  |  |  |
Incomes Taxes [Abstract] |  |  |  |
Deferred tax assets |  | 151 | 29 | 33
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred tax assets |  | 151 | 29 | 33
Recognized through profit or loss |  | 122 | (4) |
Addition (business combination) |  | 0 |  |
Deferred tax liabilities |  |  |  |
Incomes Taxes [Abstract] |  |  |  |
Deferred tax liabilities |  | 977 | 578 | 505
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Recognized through profit or loss |  | (145) | (6) |
Addition (business combination) |  | 523 | 79 |
Deferred tax liabilities |  | 977 | 578 | 505
Deferred tax liabilities | Other |  |  |  |
Incomes Taxes [Abstract] |  |  |  |
Deferred tax liabilities |  | 1 | 0 |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Recognized through profit or loss |  | 1 |  |
Addition (business combination) |  | 0 |  |
Deferred tax liabilities |  | 1 | 0 |
Deferred tax liabilities | Lease assets |  |  |  |
Incomes Taxes [Abstract] |  |  |  |
Deferred tax liabilities |  | 290 | 395 | 499
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Recognized through profit or loss |  | (106) | (104) |
Addition (business combination) |  | 0 | 0 |
Deferred tax liabilities |  | 290 | 395 | 499
Deferred tax liabilities | Asset retirement obligation |  |  |  |
Incomes Taxes [Abstract] |  |  |  |
Deferred tax liabilities |  | 87 | 104 | 6
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Recognized through profit or loss |  | (16) | 98 |
Addition (business combination) |  | 0 | 0 |
Deferred tax liabilities |  | ¥ 87 | ¥ 104 | ¥ 6
[1] | Revised based on adjustments to the original provisional amounts made in March 2025 for Next Finance Tech’s identifiable assets acquired and liabilities assumed. Next Finance Tech was acquired by the Company in March 2025.

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