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 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 | 
                                                39
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                163
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,062
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                114
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,383
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                155
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,378
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,225
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,538
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                39
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,691
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                114
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,299
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,633
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,579
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,227
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,184
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,552
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,181
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,535
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |