Employees
| Concept | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | As at 2024-12-31 | 
|---|---|---|---|---|---|
| Employees | |||||
| Metrics related to human capital diversity | |||||
| Metrics of consolidated subsidiaries | |||||
| Consolidated subsidiaries | 
                                                ㈱チューブフォーミング
                                                
                                             | 
                                                ニトックス㈱
                                                
                                             | 
                                                ㈱TFエンジニアリング
                                                
                                             | 
                                                ㈱スペースケア
                                                
                                             | 
                                                ㈱中野製作所
                                                
                                             | 
| Ratio of female employees in managerial positions | 
                                                0.000
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.000
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.000
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.087
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.000
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Ratio of male employees taking childcare leave | |||||
| All employees | 
                                                0.000
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.000
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.000
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.500
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.000
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Differences in wages between male and female employees | |||||
| All employees | 
                                                0.733
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.552
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.984
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.629
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.677
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Regular employees | 
                                                0.733
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.764
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.665
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.764
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.817
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Non-regular employees | 
                                                0.681
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.158
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1.674
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.542
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.523
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |