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Share-based payments - Disclosure of weighted average assumptions used in the calculation of fair value of stock options (Details)	12 Months Ended
	Sep. 30, 2022 CAD ($) year $ / shares	Sep. 30, 2021 CAD ($) year $ / shares
Share-Based Payment Arrangements [Abstract]
Grant date fair value (in CAD per share) | $	$ 20.94	$ 16.76
Dividend yield (%)	0.00%	0.00%
Expected volatility (%)	21.27%	20.76%
Risk-free interest rate (%)	1.28%	0.40%
Expected life (years) | year	4.00	4.00
Exercise price (in CAD per share)	$ 110.10	$ 97.86
Share price (in CAD per share)	$ 110.10	$ 97.86

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- Definition

Share-Based Payment Arrangements [Abstract]

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No definition available.

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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.

+ References

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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]]

+ References

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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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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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