Shareholdings
| Concept | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | 
|---|---|---|---|---|---|---|
| Shareholdings | ||||||
| Largest holding company | ||||||
| Investment shares reclassified from held for pure investment to held for purposes other than pure investment | ||||||
| Issue | 
                                                日本製鉄株式会社
                                                
                                             | 
                                                東京センチュリー株式会社
                                                
                                             | 
                                                久光製薬株式会社
                                                
                                             | 
                                                三菱電機株式会社
                                                
                                             | 
                                                株式会社ひろぎんホールディングス
                                                
                                             | 
                                                三菱ケミカルグループ株式会社
                                                
                                             | 
| Number of shares | 
                                                207,794
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                2,432,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                1,000,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                1,547,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                1,650,138
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                4,044,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
| Carrying amount | 
                                                762,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,859,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,973,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,886,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,800,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,704,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |