Key Financial Data Of Group
| Concept | 2024-03-01 to 2024-08-31 | As at 2024-08-31 | 2023-03-01 to 2024-02-29 | As at 2024-02-29 | As at 2023-08-31 | 2023-03-01 to 2023-08-31 | 
|---|---|---|---|---|---|---|
| Key financial data of group | ||||||
| Business results of group | ||||||
| Net sales | 
                                                730,203,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,467,931,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                750,709,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | 
                                                4,629,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                50,575,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                16,423,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | — | 
                                                382,567,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                378,643,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                344,173,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | — | 
                                                547,382,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                595,703,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                562,761,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | 
                                                2.72
                                                
                                             | — | 
                                                36.51
                                                
                                             | — | — | 
                                                12.41
                                                
                                             | 
| Diluted earnings per share | 
                                                2.72
                                                
                                             | — | 
                                                36.43
                                                
                                             | — | — | 
                                                12.37
                                                
                                             | 
| Equity-to-asset ratio | — | 
                                                0.692
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.629
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.604
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | 
                                                -4,678,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                18,555,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -15,588,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | 
                                                -20,486,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -18,687,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -10,607,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | 
                                                -15,363,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -55,082,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -30,111,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | — | 
                                                160,019,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                200,548,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                199,455,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |