Key Financial Data Of Reporting Company
| Concept | 2023-09-01 to 2023-11-30 | 2023-03-01 to 2023-11-30 | As at 2023-11-30 | 2022-03-01 to 2023-02-28 | As at 2023-02-28 | 2022-09-01 to 2022-11-30 | 2022-03-01 to 2022-11-30 | As at 2022-11-30 | 
|---|---|---|---|---|---|---|---|---|
| Key financial data of reporting company | ||||||||
| Business results of reporting company | ||||||||
| Net sales | — | 
                                                1,841,703,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,572,852,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,098,173,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Ordinary profit (loss) | — | 
                                                -250,507,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -117,094,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -32,254,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Profit (loss) | — | 
                                                -1,148,235,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -133,340,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -17,194,000
                                                
                                                    
                                                        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 | — | — | 
                                                1,611,078,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,759,313,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,875,459,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total assets | — | — | 
                                                1,902,540,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,364,476,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,230,925,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Dividend paid per share | — |  | — |  | — | — |  | — | 
| Basic earnings (loss) per share | 
                                                -358.52
                                                
                                             | 
                                                -387.54
                                                
                                             | — | 
                                                -45.00
                                                
                                             | — | 
                                                -10.24
                                                
                                             | 
                                                -5.80
                                                
                                             | — | 
| Diluted earnings per share | — |  | — |  | — | — |  | — | 
| Equity-to-asset ratio | — | — | 
                                                0.847
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.820
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.890
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |