Key Financial Data Of Reporting Company
| Concept | 2023-10-21 to 2024-04-20 | As at 2024-04-20 | 2024-01-21 to 2024-04-20 | 2022-10-21 to 2023-10-20 | As at 2023-10-20 | As at 2023-04-20 | 2023-01-21 to 2023-04-20 | 2022-10-21 to 2023-04-20 | 
|---|---|---|---|---|---|---|---|---|
| Key financial data of reporting company | ||||||||
| Business results of reporting company | ||||||||
| Net sales | 
                                                1,635,053,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,881,579,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,469,536,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | 
                                                250,117,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                185,484,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                132,229,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | — | 
                                                3,177,551,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,026,892,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,926,930,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Total assets | — | 
                                                6,283,921,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,982,973,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,634,686,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Basic earnings (loss) per share | 
                                                30.61
                                                
                                             | — | 
                                                15.41
                                                
                                             | 
                                                30.95
                                                
                                             | — | — | 
                                                9.87
                                                
                                             | 
                                                14.71
                                                
                                             | 
| Diluted earnings per share |  | — | — |  | — | — | — |  | 
| Equity-to-asset ratio | — | 
                                                0.506
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.506
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.519
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | 
                                                354,622,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                56,144,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                449,460,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | 
                                                -7,996,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -68,836,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -83,926,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | 
                                                271,016,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -22,469,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -200,312,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | — | 
                                                754,767,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                137,125,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                337,507,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — |