v3.26.1
Share-based compensation - Reconciliation of Stock Options Outstanding (Details)
12 Months Ended
Mar. 31, 2026
shares
$ / shares
Mar. 31, 2025
shares
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Outstanding - Beginning of year (in shares) | shares 10,322,548 11,083,212
Granted (in shares) | shares 3,453,170 2,637,460
Exercised (in shares) | shares (161,698) (311,307)
Forfeited (in shares) | shares (3,409,694) (3,086,817)
Outstanding - End of fiscal year (in shares) | shares 10,204,326 10,322,548
Exercisable - End of fiscal year (in shares) | shares 5,858,817 5,124,556
Weighted average exercise price, options outstanding, beginning of year, after foreign exchange adjustment (in USD per share) | $ / shares   $ 22.64
Weighted average exercise price, options outstanding, beginning of year (in USD per share) | $ / shares $ 22.12 24.73
Weighted average exercise price, options granted (in USD per share) | $ / shares 10.70 14.03
Weighted average exercise price, options exercised (in USD per share) | $ / shares 6.98 10.17
Weighted average exercise price, options forfeited (in USD per share) | $ / shares 28.62 25.78
Weighted average exercise price, options outstanding, end of year (in USD per share) | $ / shares 16.85 22.12
Weighted average exercisable price, options expired (in USD per share) | $ / shares $ 19.91 $ 26.59
Number of outstanding stock options with vesting dependent on market conditions (in shares) | shares 309,273