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 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 reporting company | |||||||||||||||
| Number of employees of reporting company | |||||||||||||||
| Number of employees | 
                                                242
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                24
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                242
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,408
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                3,985
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                242
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,311
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                243
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                4,352
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                4,348
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                289
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                305
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                4,744
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                5,266
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                340
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Average number of temporary employees | — | 
                                                12
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                933
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                953
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                8
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                934
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                829
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                889
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                797
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — |