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 | — | 
                                                127,557,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                552,825,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                129,160,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Ordinary profit (loss) | — | 
                                                31,880,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                86,047,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                15,801,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Profit (loss) attributable to owners of parent | — | 
                                                23,058,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                72,273,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                10,883,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Comprehensive income | — | 
                                                36,343,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                85,352,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                14,233,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net assets | 
                                                419,224,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                395,199,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                327,450,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total assets | 
                                                660,455,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                645,480,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                599,570,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Basic earnings (loss) per share | — | 
                                                149.76
                                                
                                             | 
                                                469.42
                                                
                                             | — | 
                                                70.69
                                                
                                             | — | 
| Diluted earnings per share | — |  |  | — |  | — | 
| Equity-to-asset ratio | 
                                                0.6348
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.6123
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.5460
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |