Employees
| Concept | As at 2025-03-31 | As at 2025-03-31 | 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 | 
                                                ㈱ジーベックス
                                                
                                             | 
                                                ㈱サンソリット
                                                
                                             | 
                                                ウシオライティング㈱
                                                
                                             | 
                                                ㈱アドテックエンジニアリング
                                                
                                             | 
                                                ㈱ヤナカアドテックプレシジョン
                                                
                                             | 
| Ratio of female employees in managerial positions | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.029
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.018
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Ratio of male employees taking childcare leave | |||||
| All employees | 
                                                1.000
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.000
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.600
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Regular employees | 
                                                1.000
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.000
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.600
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Non-regular employees | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Differences in wages between male and female employees | |||||
| All employees | 
                                                0.636
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.684
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.602
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.689
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.569
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Regular employees | 
                                                0.623
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.681
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.606
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.696
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.666
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Non-regular employees | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.542
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.535
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.408
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.559
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |