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Stock-based compensation - Reconciliation of Stock Options Outstanding (Details)
 12 Months Ended
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