Shareholdings
| Concept | 
                                    
                                        As at 2023-11-30  | 
                            
                                
                                    
                                        As at 2022-11-30  | 
                            
                        
|---|---|---|
| Shareholdings | ||
| Reporting company | ||
| Details of specified investment shares held for purposes other than pure investment | ||
| Issue | 
                                        
                                             
                                                ㈱コンコルディア・フィナンシャルグループ
                                                
                                             
                                        
                                     | 
                                
                                    — | 
| Number of shares | 
                                        
                                             
                                                70,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                102,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Carrying amount | 
                                        
                                             
                                                48,573,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                48,654,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Whether issuer of aforementioned shares holds reporting company's shares | 
                                        
                                             
                                                有
                                                
                                             
                                        
                                     | 
                                
                                    — |