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 | — | 
                                                29,189,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                93,057,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                24,760,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Ordinary profit (loss) | — | 
                                                6,104,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,153,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,779,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Profit (loss) attributable to owners of parent | — | 
                                                4,437,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,534,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,770,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Comprehensive income | — | 
                                                5,186,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,667,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,053,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net assets | 
                                                58,216,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                55,093,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                48,324,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total assets | 
                                                85,222,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                79,914,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                73,573,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Basic earnings (loss) per share | — | 
                                                320.08
                                                
                                             | 
                                                542.13
                                                
                                             | — | 
                                                197.83
                                                
                                             | — | 
| Diluted earnings per share | — |  |  | — |  | — | 
| Equity-to-asset ratio | 
                                                0.681
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.687
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.655
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |