Key Financial Data Of Group
| Concept | As at 2025-02-28 | 2024-09-01 to 2025-02-28 | As at 2024-08-31 | 2023-09-01 to 2024-08-31 | As at 2024-02-29 | 2023-09-01 to 2024-02-29 | 
|---|---|---|---|---|---|---|
| Key financial data of group | ||||||
| Business results of group | ||||||
| Net sales | — | 
                                                20,873,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                50,411,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                25,551,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                -1,338,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -5,853,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -4,310,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | — | 
                                                -1,344,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -3,705,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -4,240,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income | — | 
                                                -1,344,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -3,737,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -4,272,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                32,253,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                36,548,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                38,062,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                41,107,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                47,943,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                49,416,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                -11.56
                                                
                                             | — | 
                                                -28.19
                                                
                                             | — | 
                                                -32.08
                                                
                                             | 
| Diluted earnings per share | — |  | — |  | — |  | 
| Equity-to-asset ratio | 
                                                0.785
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.762
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.770
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                -2,274,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -4,582,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -3,401,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,187,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                104,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | 
                                                -1,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -3,999,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                31,237,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                34,511,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                37,609,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |