Key Financial Data Of Group
| Concept | 2024-03-01 to 2024-05-31 | As at 2024-05-31 | 2023-03-01 to 2024-02-29 | As at 2024-02-29 | As at 2023-05-31 | 2023-03-01 to 2023-05-31 | 
|---|---|---|---|---|---|---|
| Key financial data of group | ||||||
| Business results of group | ||||||
| Net sales | 
                                                1,006,115,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,938,768,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                964,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | 
                                                -61,846,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                117,325,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                81,533,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | 
                                                -65,572,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                88,788,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                43,295,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income | 
                                                -65,572,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                88,788,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                43,295,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | — | 
                                                988,009,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,102,814,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,053,917,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | — | 
                                                2,399,924,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,377,695,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,102,543,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | 
                                                -8.98
                                                
                                             | — | 
                                                12.16
                                                
                                             | — | — | 
                                                5.93
                                                
                                             | 
| Diluted earnings per share |  | — | 
                                                12.00
                                                
                                             | — | — | 
                                                5.88
                                                
                                             | 
| Equity-to-asset ratio | — | 
                                                0.409
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.462
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.501
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — |