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 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 | 
                                                314
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                470
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                403
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                101
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                3,782
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                446
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                637
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                6,415
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                547
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                809
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                497
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                6,264
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                414
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                5,987
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                398
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                5,943
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                5,982
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                410
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Average number of temporary employees | 
                                                11
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                8
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                4
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                206
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                358
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                627
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                40
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                630
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                602
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                587
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — |