Share capital and Contributed Surplus - Schedule of weighted-average assumptions of stock options granted (Details)	9 Months Ended	12 Months Ended
Sep. 30, 2020 CAD ($) Year $ / shares	Sep. 30, 2022 CAD ($) Year $ / shares	Sep. 30, 2021 CAD ($) Year $ / shares	Sep. 30, 2020 CAD ($) Year $ / shares
Disclosure of classes of share capital [line items]
Volatility	67.71%	90.48%	76.46%	67.71%
Dividend yield	0.00%	0.00%	0.00%	0.00%
Risk-free interest rate	0.65%	2.04%	0.35%	65.00%
Expected life (years) \| Year	4.15	2.91	2.26	3.38
Weighted-average fair value per option \| $	$ 16.1	$ 38.21	$ 50.4	$ 16.1
Bottom of range [Member]
Disclosure of classes of share capital [line items]
Stock price	$ 28	$ 14.7	$ 49	$ 28
Exercise price	28	14.7	49	28
Top of range [Member]
Disclosure of classes of share capital [line items]
Stock price	49	126.7	159.6	49
Exercise price	$ 49	$ 126.7	$ 159.6	$ 49

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
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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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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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The exercise price of share options granted.

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

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The weighted average fair value of share options granted during the period at the measurement date. [Refer: Weighted average [member]]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 2
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The weighted average share price used as input to the option pricing model to calculate the fair value of share options granted. [Refer: Option pricing model [member]; Weighted average [member]]

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