Employees
| Concept | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | 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 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Employees | ||||||||||||||
| Information about group | ||||||||||||||
| Number of employees of group | ||||||||||||||
| Number of employees | 
                                                675
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                479
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                782
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                115
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,457
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                594
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                536
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,416
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,312
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                597
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                644
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,310
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,069
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                58
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Average number of temporary employees | 
                                                184
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                158
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                53
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                15
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                237
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                173
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                203
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                247
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                208
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                194
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                175
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                196
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                119
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |