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 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 | 
                                                953
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                120
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                7,001
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                687
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                327
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                406
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                13,814
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                3,786
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,323
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                144
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                809
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,114
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                5,060
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,204
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                13,991
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                4,985
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                5,089
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                14,363
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                14,209
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                5,123
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                14,044
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                5,192
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Average number of temporary employees | 
                                                242
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                21
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                4,170
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                75
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                38
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                74
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                5,269
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                649
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                367
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                28
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                46
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                330
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,062
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                291
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                5,160
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,060
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,069
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                4,864
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                4,794
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,046
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                5,031
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,026
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |