Key Financial Data Of Reporting Company
| Concept | As at 2024-02-29 | 2023-09-01 to 2024-02-29 | 2023-12-01 to 2024-02-29 | As at 2023-08-31 | 2022-09-01 to 2023-08-31 | As at 2023-02-28 | 2022-12-01 to 2023-02-28 | 2022-09-01 to 2023-02-28 | 
|---|---|---|---|---|---|---|---|---|
| Key financial data of reporting company | ||||||||
| Business results of reporting company | ||||||||
| Net sales | — | 
                                                4,659,107,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                6,637,480,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,716,888,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                368,600,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                470,907,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                119,116,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) | — | 
                                                249,234,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                313,551,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                80,513,000
                                                
                                                    
                                                        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 | 
                                                6,494,294,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                6,344,205,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,029,054,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Total assets | 
                                                10,158,251,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                9,549,744,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                8,480,170,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividend paid per share | — |  | — | — | 
                                                55.00
                                                
                                             | — | — |  | 
| Basic earnings (loss) per share | — | 
                                                122.55
                                                
                                             | 
                                                76.61
                                                
                                             | — | 
                                                155.82
                                                
                                             | — | 
                                                38.23
                                                
                                             | 
                                                40.53
                                                
                                             | 
| Diluted earnings per share | — |  | — | — |  | — | — |  | 
| Equity-to-asset ratio | 
                                                0.639
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.664
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.711
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | 
                                                561,185,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -23,433,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -363,434,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | 
                                                -7,162,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -338,812,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                736,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | 
                                                -271,148,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -195,050,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -155,849,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                4,423,117,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,140,243,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,178,992,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — |