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Stock-based compensation - Reconciliation of Stock Options Outstanding (Details) | 12 Months Ended
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Mar. 31, 2023 shares $ / shares | Mar. 31, 2022 shares $ / shares
Disclosure of number and weighted average remaining contractual life 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
Exercised (in shares) | shares | (942,641) | (1,061,359)
Forfeited (in shares) | shares | (3,637,522) | (1,832,054)
Outstanding - End of fiscal year (in shares) | shares | 10,060,296 | 11,823,310
Exercisable - End of fiscal year (in shares) | shares | 3,771,711 | 2,600,818
Weighted average exercise price, options outstanding, beginning of year, after foreign exchange adjustment (in USD per share) | $ / shares |  | $ 36.36
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 exercised (in USD per share) | $ / shares | 5.00 | 16.48
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
Weighted average exercisable price, options expired (in USD per share) | $ / shares | $ 31.24 | $ 23.05
Share options conditional to share price |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |
Granted (in shares) | shares | 2,500,000 |

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