Employees
| Concept | As at 2024-09-30 | As at 2024-09-30 | As at 2024-09-30 | As at 2024-09-30 | As at 2024-09-30 | As at 2024-09-30 | As at 2024-09-30 | 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 2021-09-30 | As at 2020-09-30 | As at 2020-09-30 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Employees | |||||||||||||||||
| Information about group | |||||||||||||||||
| Number of employees of group | |||||||||||||||||
| Number of employees | 
                                                413
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,922
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                670
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                243
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                213
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,515
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,626
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                670
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,428
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,895
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,409
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,880
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,408
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,851
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,398
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,312
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,770
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |