Key Financial Data Of Reporting Company
| Concept | As at 2025-04-20 | 2024-10-21 to 2025-04-20 | 2023-10-21 to 2024-10-20 | As at 2024-10-20 | As at 2024-04-20 | 2023-10-21 to 2024-04-20 | 
|---|---|---|---|---|---|---|
| Key financial data of reporting company | ||||||
| Business results of reporting company | ||||||
| Net sales | — | 
                                                1,759,111,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,342,957,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,635,053,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                206,249,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                393,318,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                250,117,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                3,518,722,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,293,650,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,177,551,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                6,679,421,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                6,065,031,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,283,921,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                42.88
                                                
                                             | 
                                                49.91
                                                
                                             | — | — | 
                                                30.61
                                                
                                             | 
| Diluted earnings per share | — |  |  | — | — |  | 
| Equity-to-asset ratio | 
                                                0.527
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.543
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.506
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                -122,668,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                338,988,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                354,622,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | 
                                                -109,306,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -16,322,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -7,996,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | 
                                                395,363,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -245,827,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                271,016,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                377,351,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                213,963,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                754,767,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |