Employees
| Concept | As at 2024-01-31 | As at 2023-01-31 | As at 2022-01-31 | As at 2021-01-31 | As at 2020-01-31 | 
|---|---|---|---|---|---|
| Employees | |||||
| Information about group | |||||
| Number of employees of group | |||||
| Number of employees | 
                                                1,321
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,276
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,180
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,079
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,002
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |