Key Financial Data Of Reporting Company
| Concept | As at 2024-02-29 | 2023-06-01 to 2024-02-29 | 2023-12-01 to 2024-02-29 | As at 2023-05-31 | 2022-06-01 to 2023-05-31 | As at 2023-02-28 | 2022-12-01 to 2023-02-28 | 2022-06-01 to 2023-02-28 | 
|---|---|---|---|---|---|---|---|---|
| Key financial data of reporting company | ||||||||
| Business results of reporting company | ||||||||
| Net sales | — | 
                                                4,455,013,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                6,291,379,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,624,606,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                245,988,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                350,890,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                308,576,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) | — | 
                                                190,563,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                256,302,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                230,175,000
                                                
                                                    
                                                        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 | 
                                                2,095,606,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,915,229,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,871,123,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Total assets | 
                                                5,250,574,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,948,311,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,993,241,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividend paid per share | — |  | — | — | 
                                                19.00
                                                
                                             | — | — |  | 
| Basic earnings (loss) per share | — | 
                                                48.20
                                                
                                             | 
                                                24.52
                                                
                                             | — | 
                                                67.94
                                                
                                             | — | 
                                                21.53
                                                
                                             | 
                                                61.46
                                                
                                             | 
| Diluted earnings per share | — | 
                                                47.27
                                                
                                             | — | — | 
                                                64.12
                                                
                                             | — | — | 
                                                58.55
                                                
                                             | 
| Equity-to-asset ratio | 
                                                0.399
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.387
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.375
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — |