Key Financial Data Of Group
| Concept | As at 2023-09-30 | 2023-07-01 to 2023-09-30 | As at 2023-06-30 | 2022-07-01 to 2023-06-30 | 2022-07-01 to 2022-09-30 | As at 2022-09-30 | 
|---|---|---|---|---|---|---|
| Key financial data of group | ||||||
| Business results of group | ||||||
| Net sales | — | 
                                                673,892,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,343,580,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                880,368,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Ordinary profit (loss) | — | 
                                                -136,608,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                50,864,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -69,429,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Profit (loss) attributable to owners of parent | — | 
                                                -112,895,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -41,605,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -56,565,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Comprehensive income | — | 
                                                -111,616,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -28,321,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -41,765,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net assets | 
                                                2,099,046,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,234,272,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,220,828,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total assets | 
                                                5,315,858,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,243,468,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,729,169,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Basic earnings (loss) per share | — | 
                                                -23.91
                                                
                                             | — | 
                                                -8.81
                                                
                                             | 
                                                -11.98
                                                
                                             | — | 
| Diluted earnings per share | — |  | — |  |  | — | 
| Equity-to-asset ratio | 
                                                0.376
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.407
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.370
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |