Key Financial Data Of Reporting Company
| Concept | As at 2024-11-30 | 2024-06-01 to 2024-11-30 | As at 2024-05-31 | 2023-06-01 to 2024-05-31 | As at 2023-11-30 | 2023-06-01 to 2023-11-30 | 
|---|---|---|---|---|---|---|
| Key financial data of reporting company | ||||||
| Business results of reporting company | ||||||
| Net sales | — | 
                                                2,965,030,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,369,097,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,912,325,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                171,117,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                428,106,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                110,087,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) | — | 
                                                120,705,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                330,197,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                93,234,000
                                                
                                                    
                                                        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 | 
                                                2,322,777,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,271,221,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,977,580,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                5,504,374,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,059,267,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,081,891,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Dividend paid per share | — |  | — | 
                                                22.00
                                                
                                             | — |  | 
| Basic earnings (loss) per share | — | 
                                                30.29
                                                
                                             | — | 
                                                83.42
                                                
                                             | — | 
                                                23.63
                                                
                                             | 
| Diluted earnings per share | — | 
                                                29.82
                                                
                                             | — | 
                                                81.86
                                                
                                             | — | 
                                                23.16
                                                
                                             | 
| Equity-to-asset ratio | 
                                                0.422
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.449
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.389
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                137,174,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                637,701,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                143,152,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | 
                                                -188,158,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -232,230,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -115,474,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | 
                                                335,541,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -209,954,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                185,472,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                1,328,809,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,050,427,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,065,004,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |