v3.26.1
Reverse Recapitalization and Acquisitions of subsidiaries - Narrative (Details)
 12 Months Ended
Mar. 01, 2026
JPY (¥)
Oct. 14, 2025
JPY (¥)
Mar. 14, 2025
JPY (¥)
shares
Mar. 31, 2026
JPY (¥)
shares
Mar. 31, 2025
JPY (¥)
Mar. 31, 2024
JPY (¥)
Feb. 28, 2026
shares
$ / shares
Oct. 14, 2025
shares
$ / shares
Mar. 14, 2025
$ / shares
Disclosure of detailed information about business combination [line items]                  
Net proceeds from reverse recapitalization       ¥ 0 ¥ 205,000,000 ¥ 0      
Cash-trust and cash, net of redemptions         4,780,000,000        
Less: Ghisallo Non-Redemption Agreement       1,593,000,000 1,593,000,000        
Transaction costs and professional fees       ¥ 2,982,000,000 2,982,000,000        
Warrants issued (in shares) | shares       4,900,000          
Professional services       ¥ 4,595,000,000          
Listing expense       13,714,000,000 ¥ 13,714,000,000        
Share listing and associated expenses       18,309,000,000          
Next Finance Tech Co, Ltd.                  
Disclosure of detailed information about business combination [line items]                  
Increase (decrease) in intangible assets other than goodwill       250,000,000          
Increase in deferred tax liabilities       (79,000,000)          
Decrease in deferred tax assets       49,000,000          
Increase (decrease) in intangible assets and goodwill       122,000,000          
Number of shares issued (in shares) | shares     1,111,450            
Share price (in USD per share) | $ / shares                 $ 6.53
Acquisition-related costs ¥ 57,000,000   ¥ 11,000,000            
Goodwill expected to be deductible for tax purposes     ¥ 0            
Aplo SAS                  
Disclosure of detailed information about business combination [line items]                  
Number of shares issued (in shares) | shares               5,007,500  
Share price (in USD per share) | $ / shares               $ 4.47  
Acquisition-related costs   ¥ 289,000,000              
Revenue of acquiree since acquisition date       19,925,000,000          
Profit (loss) of acquiree since acquisition date       427,000,000          
Profit (loss) of combined entity as if combination occurred at beginning of period       (2,159,000,000)          
3iQ Corp                  
Disclosure of detailed information about business combination [line items]                  
Number of shares issued (in shares) | shares             27,910,845    
Share price (in USD per share) | $ / shares             $ 4.00    
Revenue of acquiree since acquisition date       191,000,000          
Profit (loss) of acquiree since acquisition date       11,000,000          
Profit (loss) of combined entity as if combination occurred at beginning of period       (1,678,000,000)          
Percentage acquired 99.80%                
Revenue of combined entity as if combination occurred at beginning of period       ¥ 483,139,000,000