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Share capital and share-based compensation (Tables)
 12 Months Ended
Oct. 31, 2022
Share Capital, Reserves And Other Equity Interest [Abstract]  
Schedule of Outstanding Shares
The changes in the Company’s outstanding common shares were as follows:

For the years ended October 31,20222021
NoteNumber of shares (in millions)Capital StockNumber of shares (in millions)Capital Stock
Balance, beginning of period163.3 $672.1 83.4 $15.5 
Issuance of shares - Series C private placement— — 11.2 21.6 
Issuance of shares for non-cash costs— — 0.5 0.5 
Issuance of shares - Public placement through Business Combination— — 65.7 629.7 
Exercise of RSUs0.3 3.6 0.4 3.9 
Exercise of stock options1.4 0.4 2.1 0.9 
Exercise of warrants145.7 46.0 — — 
Issuance of shares to LG Energy Solution, Ltd. and LG Chem, Ltd.5.3 49.7 — — 
Balance, end of period176.0 $771.8 163.3 $672.1 
Summary of number and weighted average exercise prices of stock options
A summary of stock option activities is as follows:
For the years ended October 31,20222021
$ millions, except number of optionsNumber of
stock options		Weighted average
exercise price of
 stock options		Number of
stock options		Weighted average
exercise price of
 stock options
Balance, beginning of the year5,296,554 2.81 5,327,980 0.38
Granted763,829 7.81 2,320,989 6.13
Exercised(1,547,113)0.46 (2,172,820)0.62
Forfeited(2,619)10.93 (179,595)1.06
Balance, end of the year4,510,651 4.46 5,296,554 2.81
Exercisable stock options3,253,287 2.70 4,242,707 0.79
A summary of the outstanding stock options is as follows:
2022
Range of exercise pricesNumber of stock options Weighted-average remaining contractual life (years)Expiration year
0.02 - 0.37
1,268,2201.242023-2024
1.07 - 2.15
1,033,0297.722029-2030
2.15 - 13.20
2,209,4028.872031-2032
Total4,510,651
Summary of assumptions used in stock option pricing The assumptions used in the stock option pricing model for the grants during the year ended October 31, 2022 were as follows:
Risk free interest rate
1.4% - 3.6%
Expected life of options
6 years
Expected dividend yield0.0%
Expected stock price volatility
63% - 70%
Expected forfeiture rate0.0%
Summary of restricted stock unit activity
A summary of RSU activities is as follows:


For the years ended October 31,		20222021
$ millions, except number of RSUs Number of
RSUs		Weighted average share price on grant dateNumber of
RSUs		Weighted average share price on grant date
Balance, beginning of the year716,76310.9387,0841.07
Granted¹1,703,9668.381,021,9558.29
Exercised(317,619)11.22(392,276)1.87
Forfeited(55,073)9.98—— 
Balance, end of the year2,048,0378.79716,76310.93