Employees
| Concept | As at 2023-10-31 | As at 2023-10-31 | As at 2023-10-31 | As at 2023-10-31 | As at 2023-10-31 | As at 2023-10-31 | As at 2022-10-31 | As at 2022-10-31 | As at 2021-10-31 | As at 2021-10-31 | As at 2020-10-31 | As at 2020-10-31 | As at 2019-10-31 | As at 2019-10-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Employees | ||||||||||||||
| Information about reporting company | ||||||||||||||
| Number of employees of reporting company | ||||||||||||||
| Number of employees | 
                                                1,297
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,151
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                373
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                479
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                146
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                106
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,299
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                481
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                474
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,370
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                471
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,474
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,525
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                469
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Average number of temporary employees | 
                                                250
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                235
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                48
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                63
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                15
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                15
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                271
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                68
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                68
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                238
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                67
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                184
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                197
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                62
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |