Notes - Goodwill And Intangible Assets
| Concept | 
                                    
                                        As at 2023-10-31  | 
                            
                                
                                    
                                        As at 2022-10-31  | 
                            
                        
|---|---|---|
| Notes - Goodwill and intangible assets | ||
| Components of goodwill and intangible assets | ||
| Acquisition cost | ||
| Goodwill | 
                                        
                                             
                                                14,100,146,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                14,100,146,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Software | 
                                        
                                             
                                                58,375,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                45,072,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Accumulated amortization and impairment | ||
| Goodwill | 
                                        
                                             
                                                -25,458,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                -25,458,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Software | 
                                        
                                             
                                                -30,451,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                -20,515,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Carrying amount | ||
| Goodwill | 
                                        
                                             
                                                14,074,688,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                14,074,688,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                            
| Software | 
                                        
                                             
                                                27,923,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                24,556,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     |