Shareholdings
| Concept | 
                                    
                                        As at 2024-03-31  | 
                            
                                
                                    
                                        As at 2024-03-31  | 
                            
                                
                                    
                                        As at 2024-03-31  | 
                            
                        
|---|---|---|---|
| Shareholdings | |||
| Reporting company | |||
| Investment shares reclassified from held for purposes other than pure investment to held for pure investment | |||
| Issue | 
                                        
                                             
                                                フォーバル
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                京都フィナンシャルグループ
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                タケダ機械
                                                
                                             
                                        
                                     | 
                                
                            
| Number of shares | 
                                        
                                             
                                                55,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                390,400
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                29,900
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Carrying amount | 
                                        
                                             
                                                72,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                1,077,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                107,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     |