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Stock-based compensation - Reconciliation of RSU, DSU and PSU Options Outstanding (Details) | 12 Months Ended
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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

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