Key Financial Data Of Group
| Concept | 2024-01-01 to 2024-03-31 | As at 2024-03-31 | 2023-07-01 to 2024-03-31 | As at 2023-06-30 | 2022-07-01 to 2023-06-30 | 2023-01-01 to 2023-03-31 | As at 2023-03-31 | 2022-07-01 to 2023-03-31 | 
|---|---|---|---|---|---|---|---|---|
| Key financial data of group | ||||||||
| Business results of group | ||||||||
| Net sales | — | — | 
                                                24,176,306,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                32,580,164,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                24,670,935,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | — | 
                                                543,657,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,353,255,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,944,964,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | — | — | 
                                                535,306,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,756,203,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,404,663,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income | — | — | 
                                                645,352,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,432,741,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,448,966,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | — | 
                                                12,014,044,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                11,856,211,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                10,872,513,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | — | 
                                                29,333,533,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                21,025,185,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                26,822,780,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | 
                                                118.49
                                                
                                             | — | 
                                                66.33
                                                
                                             | — | 
                                                218.71
                                                
                                             | 
                                                116.39
                                                
                                             | — | 
                                                175.06
                                                
                                             | 
| Diluted earnings per share | — | — | 
                                                66.11
                                                
                                             | — | 
                                                218.01
                                                
                                             | — | — | 
                                                174.49
                                                
                                             | 
| Equity-to-asset ratio | — | 
                                                0.409
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.563
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.405
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — |