Key Financial Data Of Reporting Company
| Concept | As at 2023-11-30 | 2023-09-01 to 2023-11-30 | 2023-06-01 to 2023-11-30 | As at 2023-05-31 | 2022-06-01 to 2023-05-31 | 2022-06-01 to 2022-11-30 | 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 | — | — | 
                                                2,912,325,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,291,379,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,121,245,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Ordinary profit (loss) | — | — | 
                                                110,087,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                350,890,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                207,911,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Profit (loss) | — | — | 
                                                93,234,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                256,302,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                149,290,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Equity in earnings (losses) of affiliates if equity method is applied | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Share capital | 
                                                143,172,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                143,172,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                143,172,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total number of issued shares | 
                                                4,095,500
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | 
                                                4,095,500
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | — | 
                                                4,095,500
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
| Net assets | 
                                                1,977,580,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,915,229,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,787,706,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total assets | 
                                                5,081,891,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,948,311,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                4,994,344,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Dividend paid per share | — | — |  | — | 
                                                19.00
                                                
                                             |  | — | — | 
| Basic earnings (loss) per share | — | 
                                                17.85
                                                
                                             | 
                                                23.63
                                                
                                             | — | 
                                                67.94
                                                
                                             | 
                                                39.92
                                                
                                             | 
                                                16.80
                                                
                                             | — | 
| Diluted earnings per share | — | — | 
                                                23.16
                                                
                                             | — | 
                                                64.12
                                                
                                             | 
                                                38.62
                                                
                                             | — | — | 
| Equity-to-asset ratio | 
                                                0.389
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.387
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.358
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Net cash provided by (used in) operating activities | — | — | 
                                                143,152,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                317,189,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -58,498,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | — | — | 
                                                -115,474,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -162,408,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -69,475,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | — | — | 
                                                185,472,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -172,390,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                28,064,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | 
                                                1,065,004,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                852,606,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                765,452,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |