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 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 | 
                                                270
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,982
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                4,051
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,799
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                270
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                270
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                4,290
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                4,435
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                254
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                241
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                4,654
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                4,855
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                373
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Average number of temporary employees | 
                                                28
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                661
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,453
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                764
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                28
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                29
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,404
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,447
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                27
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                23
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,530
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,487
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                23
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |