Key Financial Data Of Group
| Concept | 2023-06-01 to 2024-02-29 | As at 2024-02-29 | 2023-12-01 to 2024-02-29 | As at 2023-05-31 | 2022-06-01 to 2023-05-31 | As at 2023-02-28 | 2022-12-01 to 2023-02-28 | 2022-06-01 to 2023-02-28 | 
|---|---|---|---|---|---|---|---|---|
| Key financial data of group | ||||||||
| Business results of group | ||||||||
| Net sales | 
                                                8,390,465,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                11,367,532,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                8,522,432,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | 
                                                998,057,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,690,228,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,291,162,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | 
                                                605,137,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,493,294,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                872,485,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income | 
                                                757,592,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,651,777,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                961,799,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | — | 
                                                16,783,057,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                16,332,386,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                15,642,408,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Total assets | — | 
                                                20,639,833,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                20,634,196,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                19,662,961,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Basic earnings (loss) per share | 
                                                85.44
                                                
                                             | — | 
                                                13.10
                                                
                                             | — | 
                                                210.85
                                                
                                             | — | 
                                                35.01
                                                
                                             | 
                                                123.19
                                                
                                             | 
| Diluted earnings per share |  | — | — | — |  | — | — |  | 
| Equity-to-asset ratio | — | 
                                                0.809
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.787
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.791
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — |