Key Financial Data Of Group
| Concept | 2024-02-01 to 2024-07-31 | As at 2024-07-31 | As at 2024-01-31 | 2023-02-01 to 2024-01-31 | As at 2023-07-31 | 2023-02-01 to 2023-07-31 | 
|---|---|---|---|---|---|---|
| Key financial data of group | ||||||
| Business results of group | ||||||
| Net sales | 
                                                1,621,627,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,087,093,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,032,760,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | 
                                                56,267,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                282,710,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                238,636,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | 
                                                21,261,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,349,644,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                177,826,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income | 
                                                25,865,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,336,467,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                182,584,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | — | 
                                                2,403,387,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,434,308,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,920,986,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | — | 
                                                3,034,785,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,253,617,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,560,331,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | 
                                                2.53
                                                
                                             | — | — | 
                                                -160.68
                                                
                                             | — | 
                                                21.18
                                                
                                             | 
| Diluted earnings per share |  | — | — |  | — | 
                                                20.89
                                                
                                             | 
| Equity-to-asset ratio | — | 
                                                0.761
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.728
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.852
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | 
                                                583,673,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -29,411,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                183,309,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | 
                                                -6,744,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -657,262,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -423,890,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | 
                                                -383,332,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -56,475,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -361,139,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | — | 
                                                1,380,856,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,183,933,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,309,320,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |