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 | — | 
                                                23,749,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                94,461,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                23,613,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Ordinary profit (loss) | — | 
                                                2,963,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,522,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,791,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Profit (loss) attributable to owners of parent | — | 
                                                1,906,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,423,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,438,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Comprehensive income | — | 
                                                4,337,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,540,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,274,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net assets | 
                                                80,770,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                81,087,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                78,608,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total assets | 
                                                102,492,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                100,440,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                101,034,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Basic earnings (loss) per share | — | 
                                                15.94
                                                
                                             | 
                                                62.06
                                                
                                             | — | 
                                                20.38
                                                
                                             | — | 
| Diluted earnings per share | — |  |  | — |  | — | 
| Equity-to-asset ratio | 
                                                0.754
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.772
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.745
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |