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 | 
                                                1,782,711,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,840,572,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,692,095,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | 
                                                111,213,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                339,486,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                93,077,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | 
                                                126,119,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                437,004,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                116,517,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income | 
                                                126,119,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                437,004,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                116,517,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | — | 
                                                1,747,346,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,650,150,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,451,916,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | — | 
                                                5,778,795,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,576,263,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,501,917,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | 
                                                21.88
                                                
                                             | — | 
                                                72.99
                                                
                                             | — | — | 
                                                19.40
                                                
                                             | 
| Diluted earnings per share |  | — |  | — | — |  | 
| Equity-to-asset ratio | — | 
                                                0.301
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.295
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.262
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — |