Key Financial Data Of Reporting Company
| Concept | As at 2025-02-28 | 2024-09-01 to 2025-02-28 | 2023-09-01 to 2024-08-31 | As at 2024-08-31 | As at 2024-02-29 | 2023-09-01 to 2024-02-29 | 
|---|---|---|---|---|---|---|
| Key financial data of reporting company | ||||||
| Business results of reporting company | ||||||
| Ordinary profit (loss) | — | 
                                                -975,131,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,824,707,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -801,401,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) | — | 
                                                -976,341,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,827,127,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -802,611,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Equity in earnings (losses) of affiliates if equity method is applied | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | 
                                                876,270,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                845,270,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                90,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total number of issued shares | 
                                                68,988,800
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | 
                                                67,678,800
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                56,443,800
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | 
| Net assets | 
                                                3,246,536,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,161,297,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,698,270,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                3,451,515,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,632,370,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,902,398,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Dividend paid per share | — |  |  | — | — |  | 
| Basic earnings (loss) per share | — | 
                                                -14.31
                                                
                                             | 
                                                -31.11
                                                
                                             | — | — | 
                                                -14.22
                                                
                                             | 
| Diluted earnings per share | — |  |  | — | — |  | 
| Equity-to-asset ratio | 
                                                0.940
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.898
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.941
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                -1,114,470,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,937,248,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,052,483,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | 
                                                -667,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -10,959,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -178,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | 
                                                61,580,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,478,797,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                3,276,066,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,329,624,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,746,373,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |