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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) |  |

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