Key Financial Data Of Reporting Company
| Concept | 2024-08-01 to 2025-01-31 | As at 2025-01-31 | As at 2024-07-31 | 2023-08-01 to 2024-07-31 | As at 2024-01-31 | 2023-08-01 to 2024-01-31 | 
|---|---|---|---|---|---|---|
| Key financial data of reporting company | ||||||
| Business results of reporting company | ||||||
| Net sales | 
                                                3,123,264,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,774,730,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,950,191,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | 
                                                120,387,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                224,947,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                156,871,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) | 
                                                69,882,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                116,615,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                106,986,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Equity in earnings (losses) of affiliates if equity method is applied | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | — | 
                                                681,296,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                669,467,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                669,467,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total number of issued shares | — | 
                                                2,164,170
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                2,158,150
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | 
                                                2,158,150
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | 
| Net assets | — | 
                                                1,594,744,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,523,652,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,513,243,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | — | 
                                                4,531,655,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,272,282,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,232,105,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Dividend paid per share |  | — | — | 
                                                10.00
                                                
                                             | — |  | 
| Basic earnings (loss) per share | 
                                                32.37
                                                
                                             | — | — | 
                                                54.08
                                                
                                             | — | 
                                                49.64
                                                
                                             | 
| Diluted earnings per share |  | — | — |  | — |  | 
| Equity-to-asset ratio | — | 
                                                0.352
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.357
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.358
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | 
                                                243,590,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                373,447,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                303,875,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | 
                                                -147,780,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -383,102,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -145,549,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | 
                                                19,994,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                161,590,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                104,981,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | — | 
                                                1,183,824,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,068,020,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,179,393,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |