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Stock-based compensation - Reconciliation of RSU, DSU and PSU Options Outstanding (Details)
 12 Months Ended
Mar. 31, 2024
shares
$ / shares
Mar. 31, 2023
shares
$ / shares
Disclosure of range of exercise prices of outstanding share options [line items]    
Outstanding - Beginning of year (in shares) 10,060,296 11,823,310
Granted (in shares) 3,899,244 2,817,149
Forfeited (in shares) (2,463,548) (3,637,522)
Outstanding - End of fiscal year (in shares) 11,083,212 10,060,296
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 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
Number of outstanding stock options with vesting dependent on market conditions (in shares) 1,900,000  
RSU    
Disclosure of range of exercise prices of outstanding share options [line items]    
Outstanding - Beginning of year (in shares) 5,540,767 3,314,131
Granted (in shares) 3,114,515 4,397,629
Settled (in shares) (1,595,478) (956,837)
Forfeited (in shares) (859,036) (1,214,156)
Outstanding - End of fiscal year (in shares) 6,200,768 5,540,767
Weighted average exercise price, options outstanding, beginning of year (in USD per share) | $ / shares $ 28.92 $ 46.71
Weighted average exercise price, options granted (in USD per share) | $ / shares 14.11 20.77
Weighted average exercise price, options released (in USD per share) | $ / shares 31.18 41.58
Weighted average exercise price, options forfeited (in USD per share) | $ / shares 20.81 37.97
Weighted average exercise price, options outstanding, end of year (in USD per share) | $ / shares $ 22.02 $ 28.92
DSU    
Disclosure of range of exercise prices of outstanding share options [line items]    
Outstanding - Beginning of year (in shares) 65,398 34,421
Granted (in shares) 54,143 47,577
Settled (in shares) 0 (16,600)
Forfeited (in shares) 0 0
Outstanding - End of fiscal year (in shares) 119,541 65,398
Weighted average exercise price, options outstanding, beginning of year (in USD per share) | $ / shares $ 23.31 $ 37.95
Weighted average exercise price, options granted (in USD per share) | $ / shares 15.97 18.72
Weighted average exercise price, options released (in USD per share) | $ / shares 0 40.50
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 $ 19.99 $ 23.31
PSU    
Disclosure of range of exercise prices of outstanding share options [line items]    
Outstanding - Beginning of year (in shares) 619,640 953,290
Granted (in shares) 0 0
Settled (in shares) (167,284) (333,650)
Forfeited (in shares) (452,356) 0
Outstanding - End of fiscal year (in shares) 0 619,640
Weighted average exercise price, options outstanding, beginning of year (in USD per share) | $ / shares $ 28.73 $ 28.73
Weighted average exercise price, options granted (in USD per share) | $ / shares 0 0
Weighted average exercise price, options released (in USD per share) | $ / shares 28.73 28.73
Weighted average exercise price, options forfeited (in USD per share) | $ / shares 28.73 0
Weighted average exercise price, options outstanding, end of year (in USD per share) | $ / shares $ 0 $ 28.73