Key Financial Data Of Reporting Company
| Concept | As at 2023-12-31 | 2023-10-01 to 2023-12-31 | As at 2023-09-30 | 2022-10-01 to 2023-09-30 | As at 2022-12-31 | 2022-10-01 to 2022-12-31 | 
|---|---|---|---|---|---|---|
| Key financial data of reporting company | ||||||
| Business results of reporting company | ||||||
| Net sales | — | 
                                                1,884,780,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                7,577,563,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,799,569,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                94,719,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                685,200,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                237,468,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                4,506,925,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,538,382,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,182,362,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                8,441,944,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                8,373,744,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                7,572,881,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                22.34
                                                
                                             | — | 
                                                324.40
                                                
                                             | — | 
                                                181.43
                                                
                                             | 
| Diluted earnings per share | — | 
                                                22.02
                                                
                                             | — | 
                                                319.56
                                                
                                             | — | 
                                                178.80
                                                
                                             | 
| Equity-to-asset ratio | 
                                                0.526
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.532
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.544
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — |