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Stock-based compensation - Reconciliation of RSU, DSU and PSU Options Outstanding (Details)
 12 Months Ended
Mar. 31, 2023
shares
$ / shares
Mar. 31, 2022
shares
$ / shares
Disclosure of range of exercise prices of outstanding share options [line items]    
Outstanding - Beginning of year (in shares) | shares 11,823,310 6,796,039
Granted (in shares) | shares 2,817,149 7,920,684
Forfeited (in shares) | shares (3,637,522) (1,832,054)
Outstanding - End of fiscal year (in shares) | shares 10,060,296 11,823,310
Weighted average exercise price, options outstanding, beginning of year (in USD per share) | $ / shares $ 38.37 $ 24.56
Weighted average exercise price, options granted (in USD per share) | $ / shares 19.93 49.47
Weighted average exercise price, options forfeited (in USD per share) | $ / shares 47.76 47.84
Weighted average exercise price, options outstanding, end of year (in USD per share) | $ / shares $ 30.58 $ 38.37
RSU    
Disclosure of range of exercise prices of outstanding share options [line items]    
Outstanding - Beginning of year (in shares) | shares 3,314,131 939,833
Granted (in shares) | shares 4,397,629 3,016,792
Settled (in shares) | shares (956,837) (219,208)
Forfeited (in shares) | shares (1,214,156) (423,286)
Outstanding - End of fiscal year (in shares) | shares 5,540,767 3,314,131
Weighted average exercise price, options outstanding, beginning of year (in USD per share) | $ / shares $ 46.71 $ 44.93
Weighted average exercise price, options granted (in USD per share) | $ / shares 20.77 48.89
Weighted average exercise price, options released (in USD per share) | $ / shares 41.58 52.19
Weighted average exercise price, options forfeited (in USD per share) | $ / shares 37.97 55.50
Weighted average exercise price, options outstanding, end of year (in USD per share) | $ / shares $ 28.92 $ 46.71
DSU    
Disclosure of range of exercise prices of outstanding share options [line items]    
Outstanding - Beginning of year (in shares) | shares 34,421 14,751
Granted (in shares) | shares 47,577 20,227
Settled (in shares) | shares (16,600) (557)
Forfeited (in shares) | shares 0 0
Outstanding - End of fiscal year (in shares) | shares 65,398 34,421
Weighted average exercise price, options outstanding, beginning of year (in USD per share) | $ / shares $ 37.95 $ 26.68
Weighted average exercise price, options granted (in USD per share) | $ / shares 18.72 47.14
Weighted average exercise price, options released (in USD per share) | $ / shares 40.50 73.39
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 $ 23.31 $ 37.95
PSU    
Disclosure of range of exercise prices of outstanding share options [line items]    
Outstanding - Beginning of year (in shares) | shares 953,290 75,182
Granted (in shares) | shares 0 953,290
Settled (in shares) | shares (333,650) (51,094)
Forfeited (in shares) | shares 0 (24,088)
Outstanding - End of fiscal year (in shares) | shares 619,640 953,290
Weighted average exercise price, options outstanding, beginning of year (in USD per share) | $ / shares $ 28.73 $ 24.90
Weighted average exercise price, options granted (in USD per share) | $ / shares 0 28.73
Weighted average exercise price, options released (in USD per share) | $ / shares 28.73 24.97
Weighted average exercise price, options forfeited (in USD per share) | $ / shares 0 24.75
Weighted average exercise price, options outstanding, end of year (in USD per share) | $ / shares $ 28.73 $ 28.73