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Stock-based compensation - Reconciliation of Stock Options Outstanding (Details)
 12 Months Ended
Apr. 18, 2024
shares
Mar. 31, 2024
shares
$ / shares
Mar. 31, 2023
shares
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding - Beginning of year (in shares)   10,060,296 11,823,310
Granted (in shares)   3,899,244 2,817,149
Exercised (in shares)   (412,780) (942,641)
Forfeited (in shares)   (2,463,548) (3,637,522)
Outstanding - End of fiscal year (in shares)   11,083,212 10,060,296
Exercisable - End of fiscal year (in shares)   4,335,111 3,771,711
Weighted average exercise price, options outstanding, beginning of year, after foreign exchange adjustment (in USD per share) | $ / shares     $ 30.56
Weighted average exercise price, options outstanding, beginning of year (in USD per share) | $ / shares   $ 30.58 36.36
Weighted average exercise price, options granted (in USD per share) | $ / shares   13.77 19.93
Weighted average exercise price, options exercised (in USD per share) | $ / shares   5.20 5.00
Weighted average exercise price, options forfeited (in USD per share) | $ / shares   30.16 47.76
Weighted average exercise price, options outstanding, end of year (in USD per share) | $ / shares   25.68 30.58
Weighted average exercisable price, options expired (in USD per share) | $ / shares   $ 30.17 $ 31.24
Number of outstanding stock options with vesting dependent on market conditions (in shares)   1,900,000  
Share Option Activity      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Forfeited (in shares) (885,001,000)