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 | 
                                                5,447,543,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                10,110,524,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,006,636,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | 
                                                962,133,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,532,616,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                882,829,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | — | 
                                                4,544,492,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,271,153,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,235,433,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | — | 
                                                6,383,594,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,114,087,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,977,912,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | 
                                                63.23
                                                
                                             | — | — | 
                                                98.99
                                                
                                             | — | 
                                                58.14
                                                
                                             | 
| Diluted earnings per share |  | — | — |  | — |  | 
| Equity-to-asset ratio | — | 
                                                0.712
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.699
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.709
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | 
                                                350,076,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,126,248,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                477,629,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | 
                                                -46,146,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -5,975,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,166,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | 
                                                -396,322,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -818,544,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -422,830,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | — | 
                                                4,185,217,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,277,610,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,031,846,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |