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 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 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Employees | ||||||||||||||||||||
| Information about group | ||||||||||||||||||||
| Number of employees of group | ||||||||||||||||||||
| Number of employees | 
                                                216
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,906
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                610
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                465
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                442
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                663
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                120
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                110
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                641
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                469
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,865
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                210
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                606
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                435
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                601
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,799
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,764
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                612
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,748
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                624
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |