Employees
| Concept | As at 2024-09-30 | As at 2024-09-30 | As at 2023-09-30 | As at 2023-09-30 | As at 2022-09-30 | As at 2022-09-30 | As at 2021-09-30 | As at 2020-09-30 | 
|---|---|---|---|---|---|---|---|---|
| Employees | ||||||||
| Information about reporting company | ||||||||
| Number of employees of reporting company | ||||||||
| Number of employees | 
                                                547
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                496
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                492
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                449
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                507
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                454
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                482
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                483
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |