Shareholdings
| Concept | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | 
|---|---|---|---|---|
| Shareholdings | ||||
| Largest holding company | ||||
| Investment shares reclassified from held for purposes other than pure investment to held for pure investment | ||||
| Issue | 
                                                丸紅株式会社
                                                
                                             | 
                                                SOMPOホールディングス株式会社
                                                
                                             | 
                                                株式会社ニコン
                                                
                                             | 
                                                三菱電機株式会社
                                                
                                             | 
| Number of shares | 
                                                1,568,700
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                484,250
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                6,121,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                3,380,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
| Carrying amount | 
                                                3,733,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,189,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,071,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,194,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |