Key Financial Data Of Reporting Company
| 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 reporting company | ||||||
| Business results of reporting company | ||||||
| Net sales | 
                                                1,266,505,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,205,457,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,385,867,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | 
                                                -61,455,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -371,162,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -120,580,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) | 
                                                -61,800,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,281,854,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -85,978,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Equity in earnings (losses) of affiliates if equity method is applied | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | — | 
                                                401,160,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                401,160,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                401,160,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total number of issued shares | — | 
                                                2,963,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | 
                                                2,963,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                2,963,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | 
| Net assets | — | 
                                                1,415,628,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,477,429,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,673,334,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | — | 
                                                1,622,758,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,646,593,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,038,702,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Dividend paid per share |  | — |  | — | — |  | 
| Basic earnings (loss) per share | 
                                                -20.86
                                                
                                             | — | 
                                                -432.63
                                                
                                             | — | — | 
                                                -29.02
                                                
                                             | 
| Diluted earnings per share |  | — |  | — | — |  | 
| Equity-to-asset ratio | — | 
                                                0.872
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.897
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.880
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | 
                                                -49,140,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -398,402,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -422,493,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | 
                                                -9,454,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -114,786,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -69,494,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | 
                                                -71,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -250,171,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -110,071,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | — | 
                                                824,646,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                883,312,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,044,613,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |