Employees
| Concept | As at 2024-05-31 | As at 2024-05-31 | As at 2024-05-31 | As at 2024-05-31 | As at 2024-05-31 | As at 2024-05-31 | As at 2024-05-31 | As at 2024-05-31 | As at 2023-05-31 | As at 2023-05-31 | As at 2022-05-31 | As at 2022-05-31 | As at 2021-05-31 | As at 2021-05-31 | As at 2020-05-31 | As at 2020-05-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Employees | ||||||||||||||||
| Information about group | ||||||||||||||||
| Number of employees of group | ||||||||||||||||
| Number of employees | 
                                                830
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                290
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                450
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,048
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                504
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                36
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                562
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                36
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,094
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                863
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                884
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,106
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                871
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,075
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                859
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,003
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Average number of temporary employees | 
                                                177
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                82
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                172
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                304
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                89
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                6
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                126
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                6
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                307
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                187
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                182
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                300
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                220
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                329
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                191
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                299
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |