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 | 
                                                6,583,846,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                22,698,846,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,072,309,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Ordinary profit (loss) | 
                                                1,264,308,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,991,074,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,136,072,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net assets | — | 
                                                27,053,454,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                26,538,803,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                25,098,977,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total assets | — | 
                                                38,307,422,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                34,504,281,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                35,980,925,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Basic earnings (loss) per share | 
                                                124.68
                                                
                                             | — | 
                                                278.68
                                                
                                             | — | 
                                                107.71
                                                
                                             | — | 
| Diluted earnings per share |  | — |  | — |  | — | 
| Equity-to-asset ratio | — | 
                                                0.706
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.769
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.698
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |