Employees
| Concept | 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 | 
                                                13,643
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                13,643
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                4,105
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                4,105
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                4,806
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                14,754
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                14,484
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                4,867
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                3,943
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                14,522
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                15,455
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                4,647
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |