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Stock-based compensation - Reconciliation of Stock Options Outstanding (Details)
 12 Months Ended
Mar. 31, 2022
shares
$ / shares
Mar. 31, 2021
shares
$ / shares
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]    
Outstanding - Beginning of year (in shares) | shares 6,796,039 7,557,574
Granted (in shares) | shares 7,920,684 2,183,108
Assumed through business combination (in shares) | shares 0 1,226,214
Exercised (in shares) | shares (1,061,359) (2,951,034)
Forfeited (in shares) | shares (1,832,054) (1,219,823)
Outstanding - End of fiscal year (in shares) | shares 11,823,310 6,796,039
Exercisable - End of fiscal year (in shares) | shares 2,600,818 1,523,685
Weighted average exercise price, options outstanding, beginning of year, after foreign exchange adjustment (in USD per share) | $ / shares   $ 24.56
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 assumed in business combination (in USD per share) | $ / shares 0 6.40
Weighted average exercise price, options exercised (in USD per share) | $ / shares 16.48 7.12
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
Weighted average exercisable price, options expired (in USD per share) | $ / shares $ 23.05 $ 17.40
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