Employees
| Concept | 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 | 
                                                (株)ニコンシステム
                                                
                                             | 
                                                (株)栃木ニコンプレシジョン
                                                
                                             | 
                                                (株)栃木ニコン
                                                
                                             | 
                                                (株)ニコンプロダクトサポート
                                                
                                             | 
| Ratio of female employees in managerial positions | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.023
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Ratio of male employees taking childcare leave | ||||
| All employees | 
                                                1.250
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1.000
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1.000
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1.000
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Differences in wages between male and female employees | ||||
| All employees | 
                                                0.883
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.660
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.705
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.762
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Regular employees | 
                                                0.864
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.686
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.717
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.796
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Non-regular employees | 
                                                0.768
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.757
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.716
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.781
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |