Key Financial Data Of Reporting Company
| Concept | 2023-04-01 to 2023-12-31 | As at 2023-12-31 | 2023-10-01 to 2023-12-31 | As at 2023-03-31 | 2022-04-01 to 2023-03-31 | As at 2022-12-31 | 2022-04-01 to 2022-12-31 | 2022-10-01 to 2022-12-31 | 
|---|---|---|---|---|---|---|---|---|
| Key financial data of reporting company | ||||||||
| Business results of reporting company | ||||||||
| Net sales | 
                                                51,713,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                70,466,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                50,502,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Ordinary profit (loss) | 
                                                2,705,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                3,458,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,422,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net assets | — | 
                                                33,060,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                31,848,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                31,255,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Total assets | — | 
                                                55,614,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                56,128,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                52,607,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Basic earnings (loss) per share | 
                                                113.49
                                                
                                             | — | 
                                                37.75
                                                
                                             | — | 
                                                142.34
                                                
                                             | — | 
                                                99.54
                                                
                                             | 
                                                51.42
                                                
                                             | 
| Diluted earnings per share |  | — | — | — |  | — |  | — | 
| Equity-to-asset ratio | — | 
                                                0.586
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.560
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.586
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — |