Employees
| Concept | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2021-03-31 | As at 2021-03-31 | As at 2020-03-31 | As at 2020-03-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Employees | |||||||||||||||
| Information about group | |||||||||||||||
| Number of employees of group | |||||||||||||||
| Number of employees | 
                                                464
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                154
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                176
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                477
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                9
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                13
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                13
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                518
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                199
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                225
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                565
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                610
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                226
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                228
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                658
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Average number of temporary employees | 
                                                2,532
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                937
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,015
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,538
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                72
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                6
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                6
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,527
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,119
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,159
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,554
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,396
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,179
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,420
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                3,280
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |