v3.26.1
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.