Key Financial Data Of Reporting Company
| Concept | 2024-01-01 to 2024-03-31 | As at 2024-03-31 | 2023-01-01 to 2023-12-31 | As at 2023-12-31 | 2023-01-01 to 2023-03-31 | As at 2023-03-31 | 
|---|---|---|---|---|---|---|
| Key financial data of reporting company | ||||||
| Business results of reporting company | ||||||
| Net sales | 
                                                2,747,644,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                9,722,408,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,687,795,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Ordinary profit (loss) | 
                                                463,257,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,467,465,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                486,766,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net assets | — | 
                                                8,391,543,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                8,291,905,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                7,814,274,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total assets | — | 
                                                11,121,116,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                10,767,513,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                10,126,454,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Basic earnings (loss) per share | 
                                                46.06
                                                
                                             | — | 
                                                146.44
                                                
                                             | — | 
                                                48.41
                                                
                                             | — | 
| Diluted earnings per share |  | — |  | — |  | — | 
| Equity-to-asset ratio | — | 
                                                0.755
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.770
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.772
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |