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Stock-based compensation - Reconciliation of RSU, DSU and PSU Options Outstanding (Details)
 12 Months Ended
Mar. 31, 2022
shares
$ / shares
Mar. 31, 2021
shares
$ / shares
Disclosure of range of exercise prices of outstanding share options [line items]    
Outstanding - Beginning of year (in shares) 6,796,039 7,557,574
Granted (in shares) 7,920,684 2,183,108
Forfeited (in shares) (1,832,054) (1,219,823)
Outstanding - End of fiscal year (in shares) 11,823,310 6,796,039
Weighted average exercise price, options outstanding, beginning of year (in USD per share) | $ / shares $ 24.48 $ 15.38
Weighted average exercise price, options granted (in USD per share) | $ / shares 49.47 41.55
Weighted average exercise price, options forfeited (in USD per share) | $ / shares 47.84 22.48
Weighted average exercise price, options outstanding, end of year (in USD per share) | $ / shares $ 38.37 $ 24.48
RSU    
Disclosure of range of exercise prices of outstanding share options [line items]    
Outstanding - Beginning of year (in shares) 939,833 117,769
Granted (in shares) 3,016,792 989,384
Released (in shares) (219,208) (36,515)
Forfeited (in shares) (423,286) (130,805)
Outstanding - End of fiscal year (in shares) 3,314,131 939,833
Weighted average exercise price, options outstanding, beginning of year (in USD per share) | $ / shares $ 44.93 $ 24.67
Weighted average exercise price, options granted (in USD per share) | $ / shares 48.89 45.73
Weighted average exercise price, options released (in USD per share) | $ / shares 52.19 32.17
Weighted average exercise price, options forfeited (in USD per share) | $ / shares 55.50 36.30
Weighted average exercise price, options outstanding, end of year (in USD per share) | $ / shares $ 46.71 $ 44.93
DSU    
Disclosure of range of exercise prices of outstanding share options [line items]    
Outstanding - Beginning of year (in shares) 14,751 7,109
Granted (in shares) 20,227 7,642
Released (in shares) (557) 0
Forfeited (in shares) 0 0
Outstanding - End of fiscal year (in shares) 34,421 14,751
Weighted average exercise price, options outstanding, beginning of year (in USD per share) | $ / shares $ 26.68 $ 25.66
Weighted average exercise price, options granted (in USD per share) | $ / shares 47.14 27.64
Weighted average exercise price, options released (in USD per share) | $ / shares 73.39 0
Weighted average exercise price, options forfeited (in USD per share) | $ / shares 0 0
Weighted average exercise price, options outstanding, end of year (in USD per share) | $ / shares $ 37.95 $ 26.68
PSU    
Disclosure of range of exercise prices of outstanding share options [line items]    
Outstanding - Beginning of year (in shares) 75,182 84,326
Granted (in shares) 953,290 66,038
Released (in shares) (51,094) (51,094)
Forfeited (in shares) (24,088) (24,088)
Outstanding - End of fiscal year (in shares) 953,290 75,182
Weighted average exercise price, options outstanding, beginning of year (in USD per share) | $ / shares $ 24.90 $ 24.75
Weighted average exercise price, options granted (in USD per share) | $ / shares 28.73 25.09
Weighted average exercise price, options released (in USD per share) | $ / shares 24.97 24.97
Weighted average exercise price, options forfeited (in USD per share) | $ / shares 24.75 24.75
Weighted average exercise price, options outstanding, end of year (in USD per share) | $ / shares $ 28.73 $ 24.90
Share options conditional to share price    
Disclosure of range of exercise prices of outstanding share options [line items]    
Granted (in shares) 2,500,000