Share capital - Summary of Detailed Information About Assumptions Used in Stock Option Pricing Model (Detail) - Option pricing model [member] - yr	9 Months Ended	12 Months Ended
Jul. 31, 2021	Oct. 31, 2020
Disclosure Of Assumptions Used In Stock Option Pricing Model [line items]
Risk free interest rate	0.46%
Expected life of options	10	10
Expected dividend yield	0.00%	0.00%
Expected stock price volatility	65.00%	65.00%
Expected forfeiture rate	0.00%	0.00%
Bottom of range [member]
Disclosure Of Assumptions Used In Stock Option Pricing Model [line items]
Risk free interest rate		0.35%
Top of range [member]
Disclosure Of Assumptions Used In Stock Option Pricing Model [line items]
Risk free interest rate		0.45%

The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2020-01-01
-Paragraph 47
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-Clause i
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-URIDate 2020-01-01

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The option life of share options granted.

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The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]]

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The percentage of an expected dividend used to calculate the fair value of share options granted.

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Description of expected forfeiture rate share options granted.

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Disclosure of assumptions used in stock option pricing model.

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