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Stock-based compensation (Tables)
12 Months Ended
Mar. 31, 2024
Disclosure Of Share Based Payment Arrangements [Abstract]  
Stock option activity and the weighted average exercise price
The stock option activity and the weighted average exercise price are summarized as follows:
20242023
Number
of options
Weighted
average
exercise
price
Number
of options
Weighted
average
exercise
price
$
$
Outstanding – Beginning of year*10,060,296 30.56 11,823,310 36.36 
Granted3,899,244 13.77 2,817,149 19.93 
Exercised(412,780)5.20 (942,641)5.00 
Forfeited/Cancelled(2,463,548)30.16 (3,637,522)47.76 
Outstanding – End of fiscal year**11,083,212 25.68 10,060,296 30.58 
Exercisable – End of fiscal year4,335,111 30.17 3,771,711 31.24 
*The 2024 beginning of year weighted average exercise price was adjusted from the prior year closing weighted average exercise price to account for the CAD to USD foreign exchange rate used when calculating the current fiscal year's weighted average exercise prices.
**The stock options outstanding as at March 31, 2024 included 1,900,000 stock options with vesting dependent on market conditions tied to the Company's future share price performance. On April 18, 2024, 885,001 stock options with vesting dependent on market conditions tied to the Company's future share price performance were forfeited.
The RSU, DSU and PSU activity and the weighted average grant date fair values
The RSU, DSU and PSU activity and the weighted average grant date fair values as at March 31, 2024 are summarized as follows:
202420242024
RSUDSUPSU
Number
of awards
Weighted
average
grant date
fair value
Number
of awards
Weighted
average
grant date
fair value
Number
of awards
Weighted
average
grant date
fair value
$$$
Outstanding – Beginning of year5,540,767 28.92 65,398 23.31 619,640 28.73 
Granted3,114,515 14.11 54,143 15.97 — — 
Settled(1,595,478)31.18 — — (167,284)28.73 
Forfeited(859,036)20.81 — — (452,356)28.73 
Outstanding – End of year6,200,768 22.02 119,541 19.99 — — 
The RSU, DSU and PSU activity and the weighted average grant date fair values as at March 31, 2023 are summarized as follows:
202320232023
RSUDSUPSU
Number
of awards
Weighted
average
grant date
fair value
Number
of awards
Weighted
average
grant date
fair value
Number
of awards
Weighted
average
grant date
fair value
$$$
Outstanding – Beginning of year3,314,131 46.71 34,421 37.95 953,290 28.73 
Granted4,397,629 20.77 47,577 18.72 — — 
Settled(956,837)41.58 (16,600)40.50 (333,650)28.73 
Forfeited(1,214,156)37.97 — — — — 
Outstanding – End of year5,540,767 28.92 65,398 23.31 619,640 28.73 
Weighted average assumptions
The fair value of stock options granted to employees, excluding stock options that contain market conditions, was estimated at the dates of grant using the Black-Scholes option-pricing model with the following weighted average assumptions:
20242023
Expected volatility63.64 %52.22 %
Risk-free interest rate3.85 %3.05 %
Expected option life3.80 years3.92 years
Expected dividend yield%%
Forfeiture rate29.53 %26.55 %
Range of exercise prices of outstanding share options
The following table summarizes information with respect to stock options outstanding and stock options exercisable as at March 31, 2024:
Options outstandingOptions exercisable
Exercise
price
Number
of options
Weighted
average
remaining
contractual
life (years)
Weighted
average
exercise
price
Number
of options
Weighted
average
remaining
contractual
life (years)
Weighted
average
exercise
price
$$$
2.17 to 13.35
2,483,720 5.5112.46 787,825 4.1210.62 
13.36 to 17.01
2,169,016 6.1114.69 419,481 5.7614.72 
17.02 to 23.25
2,137,549 4.5520.94 1,033,606 3.8021.42 
23.26 to 31.69
2,469,252 4.3129.05 804,717 3.1525.37 
31.70 to 93.45
1,823,675 3.8757.75 1,289,482 3.6357.16 
Total11,083,212 4.9125.68 4,335,111 3.8830.17 
The following table summarizes information with respect to stock options outstanding stock options exercisable as at March 31, 2023:
Options outstandingOptions exercisable
Exercise
price
Number
of options
Weighted
average
remaining
contractual
life (years)
Weighted
average
exercise
price
Number
of options
Weighted
average
remaining
contractual
life (years)
Weighted
average
exercise
price
$$$
2.17 to 18.92
1,930,537 5.0912.19 719,850 2.215.80 
18.93 to 22.62
1,886,776 5.6121.49 384,078 4.2421.79 
22.63 to 27.73
2,268,067 4.4623.99 1,409,502 3.7724.27 
27.74 to 41.54
1,896,698 5.5131.49 291,923 3.7931.80 
41.55 to 93.45
2,078,218 5.4262.27 966,358 5.3863.92 
Total10,060,296 5.1930.58 3,771,711 3.9431.24 
Stock options outstanding and stock options exercisable
The following table summarizes information with respect to stock options outstanding and stock options exercisable as at March 31, 2024:
Options outstandingOptions exercisable
Exercise
price
Number
of options
Weighted
average
remaining
contractual
life (years)
Weighted
average
exercise
price
Number
of options
Weighted
average
remaining
contractual
life (years)
Weighted
average
exercise
price
$$$
2.17 to 13.35
2,483,720 5.5112.46 787,825 4.1210.62 
13.36 to 17.01
2,169,016 6.1114.69 419,481 5.7614.72 
17.02 to 23.25
2,137,549 4.5520.94 1,033,606 3.8021.42 
23.26 to 31.69
2,469,252 4.3129.05 804,717 3.1525.37 
31.70 to 93.45
1,823,675 3.8757.75 1,289,482 3.6357.16 
Total11,083,212 4.9125.68 4,335,111 3.8830.17 
The following table summarizes information with respect to stock options outstanding stock options exercisable as at March 31, 2023:
Options outstandingOptions exercisable
Exercise
price
Number
of options
Weighted
average
remaining
contractual
life (years)
Weighted
average
exercise
price
Number
of options
Weighted
average
remaining
contractual
life (years)
Weighted
average
exercise
price
$$$
2.17 to 18.92
1,930,537 5.0912.19 719,850 2.215.80 
18.93 to 22.62
1,886,776 5.6121.49 384,078 4.2421.79 
22.63 to 27.73
2,268,067 4.4623.99 1,409,502 3.7724.27 
27.74 to 41.54
1,896,698 5.5131.49 291,923 3.7931.80 
41.55 to 93.45
2,078,218 5.4262.27 966,358 5.3863.92 
Total10,060,296 5.1930.58 3,771,711 3.9431.24