Employees
| Concept | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | 
|---|---|---|---|
| Employees | |||
| Metrics related to human capital diversity | |||
| Metrics of consolidated subsidiaries | |||
| Consolidated subsidiaries | 
                                                菱和エアコン㈱
                                                
                                             | 
                                                東京ダイヤエアコン㈱
                                                
                                             | 
                                                松浦電機システム㈱
                                                
                                             | 
| Ratio of female employees in managerial positions | 
                                                0.090
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.083
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.066
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Ratio of male employees taking childcare leave | |||
| All employees | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Differences in wages between male and female employees | |||
| All employees | 
                                                0.911
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.801
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.679
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Regular employees | 
                                                0.898
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.896
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.673
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Non-regular employees | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.633
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.476
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |