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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, 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 |

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