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Share-based payments - Disclosure of information concerning PSUs (Details) - PSUs	12 Months Ended
	Sep. 30, 2022 CAD ($) shares	Sep. 30, 2021 CAD ($) shares
Disclosure of terms and conditions of share-based payment arrangement [line items]
Outstanding, beginning of period (in shares)	1,416,203	1,231,470
Granted (in shares)	805,699	669,252
Exercised (in shares)	(237,294)	(119,108)
Forfeited (in shares)	(175,017)	(365,411)
Outstanding, end of period (in shares)	1,809,591	1,416,203
Grant date fair value (in CAD per share) | $	$ 109.07	$ 94.00

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- Definition

The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement.

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The number of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement.

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The number of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement.

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The weighted average fair value at the measurement date of granted equity instruments other than share options. [Refer: Weighted average [member]]

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