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 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 | 
                                                24
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,039
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                3,455
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                472
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                343
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                35,230
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                56
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,605
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                195
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,336
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,872
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                472
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                243
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                626
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                25,202
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                959
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                35,243
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,312
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,299
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                35,502
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                35,165
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,249
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                35,057
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,217
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Average number of temporary employees | 
                                                5
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                161
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                164
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                81
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                31
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                14,949
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                6
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                3,109
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                34
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                191
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                280
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                81
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                34
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                75
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                11,018
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                61
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                11,738
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                190
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                184
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                11,043
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                11,200
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                158
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                10,987
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                144
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |