Key Financial Data Of Reporting Company
| Concept | 2023-09-01 to 2023-11-30 | As at 2023-11-30 | As at 2023-08-31 | 2022-09-01 to 2023-08-31 | 2022-09-01 to 2022-11-30 | As at 2022-11-30 | 
|---|---|---|---|---|---|---|
| Key financial data of reporting company | ||||||
| Business results of reporting company | ||||||
| Net sales | 
                                                2,057,778,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                6,637,480,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                996,379,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Ordinary profit (loss) | 
                                                139,834,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                470,907,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,581,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Profit (loss) | 
                                                93,595,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                313,551,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,510,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Equity in earnings (losses) of affiliates if equity method is applied | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Share capital | — | 
                                                1,408,600,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,408,600,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,408,600,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total number of issued shares | — | 
                                                2,200,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                2,200,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | 
                                                2,200,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
| Net assets | — | 
                                                6,334,937,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,344,205,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,922,537,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total assets | — | 
                                                9,472,504,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,549,744,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                8,434,175,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Dividend paid per share |  | — | — | 
                                                55.00
                                                
                                             |  | — | 
| Basic earnings (loss) per share | 
                                                45.97
                                                
                                             | — | — | 
                                                155.82
                                                
                                             | 
                                                2.27
                                                
                                             | — | 
| Diluted earnings per share |  | — | — |  |  | — | 
| Equity-to-asset ratio | — | 
                                                0.669
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.664
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.702
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Net cash provided by (used in) operating activities | 
                                                65,292,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -23,433,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -679,167,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | 
                                                -665,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -338,812,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | 
                                                -162,778,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -195,050,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -159,969,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | — | 
                                                4,042,093,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,140,243,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,858,402,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |