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 | 
                                                18,132,352,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                22,627,321,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                16,878,024,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Ordinary profit (loss) | 
                                                908,171,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,396,120,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                958,944,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net assets | — | 
                                                19,866,483,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                19,556,474,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                19,238,491,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Total assets | — | 
                                                28,912,129,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                26,191,190,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                26,954,325,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Basic earnings (loss) per share | 
                                                82.90
                                                
                                             | — | 
                                                53.70
                                                
                                             | — | 
                                                142.95
                                                
                                             | — | 
                                                89.88
                                                
                                             | 
                                                80.17
                                                
                                             | 
| Diluted earnings per share |  | — | — | — |  | — |  | — | 
| Equity-to-asset ratio | — | 
                                                0.687
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.747
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.713
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — |