Key Financial Data Of Group
| Concept | 2023-07-01 to 2024-03-31 | As at 2024-03-31 | 2024-01-01 to 2024-03-31 | As at 2023-06-30 | 2022-07-01 to 2023-06-30 | As at 2023-03-31 | 2023-01-01 to 2023-03-31 | 2022-07-01 to 2023-03-31 | 
|---|---|---|---|---|---|---|---|---|
| Key financial data of group | ||||||||
| Business results of group | ||||||||
| Net sales | 
                                                1,050,340,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,353,869,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,019,022,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | 
                                                83,457,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                204,135,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                225,691,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | — | 
                                                3,297,998,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,166,377,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,193,252,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Total assets | — | 
                                                3,692,588,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,576,114,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,587,347,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Basic earnings (loss) per share | 
                                                14.41
                                                
                                             | — | 
                                                17.38
                                                
                                             | — | 
                                                62.85
                                                
                                             | — | 
                                                27.19
                                                
                                             | 
                                                70.24
                                                
                                             | 
| Diluted earnings per share | 
                                                12.82
                                                
                                             | — | — | — |  | — | — |  | 
| Equity-to-asset ratio | — | 
                                                0.893
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.739
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.751
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — |