Key Financial Data Of Group
| Concept | As at 2024-03-31 | 2024-01-01 to 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 group | ||||||
| Business results of group | ||||||
| Net sales | — | 
                                                4,781,698,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                19,562,478,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,833,122,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Ordinary profit (loss) | — | 
                                                1,446,639,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,727,251,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,307,376,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Profit (loss) attributable to owners of parent | — | 
                                                1,037,236,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,968,243,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                893,944,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Comprehensive income | — | 
                                                3,651,969,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,369,344,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                899,850,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net assets | 
                                                35,758,864,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                34,061,787,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                28,530,938,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total assets | 
                                                44,848,103,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                41,674,024,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                33,327,674,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Basic earnings (loss) per share | — | 
                                                58.13
                                                
                                             | 
                                                222.54
                                                
                                             | — | 
                                                50.14
                                                
                                             | — | 
| Diluted earnings per share | — | 
                                                57.31
                                                
                                             | 
                                                220.05
                                                
                                             | — | 
                                                49.73
                                                
                                             | — | 
| Equity-to-asset ratio | 
                                                0.795
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.815
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.854
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |