Key Financial Data Of Group
| Concept | As at 2024-08-31 | 2024-03-01 to 2024-08-31 | 2023-03-01 to 2024-02-29 | As at 2024-02-29 | 2023-03-01 to 2023-08-31 | As at 2023-08-31 | 
|---|---|---|---|---|---|---|
| Key financial data of group | ||||||
| Business results of group | ||||||
| Net sales | — | 
                                                5,242,271,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,730,666,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,708,131,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Ordinary profit (loss) | — | 
                                                508,946,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                825,866,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                417,393,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Profit (loss) attributable to owners of parent | — | 
                                                322,325,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                358,929,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                265,744,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Comprehensive income | — | 
                                                405,544,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                456,235,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                317,460,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net assets | 
                                                3,032,891,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,744,419,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,605,844,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total assets | 
                                                6,180,232,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,419,953,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,243,453,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Basic earnings (loss) per share | — | 
                                                349.16
                                                
                                             | 
                                                388.78
                                                
                                             | — | 
                                                287.83
                                                
                                             | — | 
| Diluted earnings per share | — |  |  | — |  | — | 
| Equity-to-asset ratio | 
                                                0.455
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.475
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.473
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Net cash provided by (used in) operating activities | — | 
                                                491,591,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                821,794,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                483,331,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -140,238,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -576,425,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -252,913,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | — | 
                                                360,950,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -119,614,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -22,382,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | 
                                                1,756,431,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,011,645,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,091,230,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |