Key Financial Data Of Reporting Company
| Concept | As at 2023-12-31 | 2023-07-01 to 2023-12-31 | 2023-10-01 to 2023-12-31 | 
|---|---|---|---|
| Key financial data of reporting company | |||
| Business results of reporting company | |||
| Net sales | — | 
                                                3,167,548,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Ordinary profit (loss) | — | 
                                                125,422,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net assets | 
                                                2,281,411,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Total assets | 
                                                4,670,174,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Basic earnings (loss) per share | — | 
                                                21.63
                                                
                                             | 
                                                -1.59
                                                
                                             | 
| Diluted earnings per share | — | 
                                                21.45
                                                
                                             | — | 
| Equity-to-asset ratio | 
                                                0.4880
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | 
                                                3,780,297,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | — | 
                                                45,351,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -3,081,137,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | 
                                                1,762,813,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — |