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 | — | 
                                                764,571,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,264,846,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,137,779,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                -103,208,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -188,352,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -68,920,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | — | 
                                                -104,230,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -310,591,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -188,220,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income | — | 
                                                -82,438,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -284,720,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -159,509,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                2,774,759,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,857,198,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,952,332,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                3,068,426,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,311,585,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,546,260,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                -7.05
                                                
                                             | — | 
                                                -21.05
                                                
                                             | — | 
                                                -12.76
                                                
                                             | 
| Diluted earnings per share | — |  | — |  | — |  | 
| Equity-to-asset ratio | 
                                                0.904
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.863
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.833
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                -178,761,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -100,707,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -33,548,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | 
                                                19,717,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -68,787,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -29,188,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | 
                                                -40,959,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                11,412,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -18,813,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                2,179,191,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,376,748,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,463,201,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |