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 | 
                                                139,504,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                185,961,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                130,088,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Ordinary profit (loss) | 
                                                6,882,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                9,288,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,851,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net assets | — | 
                                                86,440,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                82,424,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                79,310,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Total assets | — | 
                                                150,353,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                148,544,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                139,380,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Basic earnings (loss) per share | 
                                                119.41
                                                
                                             | — | 
                                                63.11
                                                
                                             | — | 
                                                154.78
                                                
                                             | — | 
                                                93.43
                                                
                                             | 
                                                22.29
                                                
                                             | 
| Diluted earnings per share |  | — | — | — |  | — |  | — | 
| Equity-to-asset ratio | — | 
                                                0.573
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.554
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.568
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — |