Notes - Segment Information, Etc.
| Concept | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | 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 | As at 2024-03-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Notes - Segment information, etc. | ||||||||||||
| Amortization and unamortized balance of goodwill for each reportable segment | ||||||||||||
| Amortization and unamortized balance of goodwill for each reportable segment | ||||||||||||
| Goodwill | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,293,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,293,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,184,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,890,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,518,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,518,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,279,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,798,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |