Key Financial Data Of Group
| Concept | As at 2025-03-31 | 2024-10-01 to 2025-03-31 | As at 2024-09-30 | 2023-10-01 to 2024-09-30 | 
|---|---|---|---|---|
| Key financial data of group | ||||
| Business results of group | ||||
| Net sales | — | 
                                                590,687,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,563,081,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                -162,141,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -865,765,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                492,554,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                735,537,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                1,255,503,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,569,233,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                -23.21
                                                
                                             | — | 
                                                -82.92
                                                
                                             | 
| Diluted earnings per share | — |  | — |  | 
| Equity-to-asset ratio | 
                                                0.392
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.469
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                -180,892,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -207,224,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | 
                                                -76,297,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -25,164,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | 
                                                -5,040,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -36,850,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                291,593,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                553,823,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |