Key Financial Data Of Group
| Concept | 2024-03-01 to 2024-05-31 | As at 2024-05-31 | 2023-09-01 to 2024-05-31 | 2022-09-01 to 2023-08-31 | As at 2023-08-31 | As at 2023-05-31 | 2022-09-01 to 2023-05-31 | 2023-03-01 to 2023-05-31 | 
|---|---|---|---|---|---|---|---|---|
| Key financial data of group | ||||||||
| Business results of group | ||||||||
| Net sales | — | — | 
                                                1,739,021,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,428,748,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,863,667,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Ordinary profit (loss) | — | — | 
                                                -89,089,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                56,438,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                76,913,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Profit (loss) attributable to owners of parent | — | — | 
                                                -251,677,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -27,777,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                33,410,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Comprehensive income | — | — | 
                                                -203,784,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,892,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                50,679,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net assets | — | 
                                                2,908,165,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,111,661,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,149,385,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Total assets | — | 
                                                3,504,754,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,672,705,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,701,523,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Basic earnings (loss) per share | 
                                                -4.30
                                                
                                             | — | 
                                                -17.06
                                                
                                             | 
                                                -1.88
                                                
                                             | — | — | 
                                                2.27
                                                
                                             | 
                                                0.04
                                                
                                             | 
| Diluted earnings per share | — | — |  |  | — | — | 
                                                2.26
                                                
                                             | — | 
| Equity-to-asset ratio | — | 
                                                0.830
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.847
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.851
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — |