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Share-based payments - Disclosure of information concerning PSUs (Details) - PSUs	12 Months Ended
	Sep. 30, 2023 CAD ($) shares	Sep. 30, 2022 CAD ($) shares
Disclosure of terms and conditions of share-based payment arrangement [line items]
Outstanding, beginning of period (in shares)	1,809,591	1,416,203
Granted (in shares)	899,511	805,699
Exercised (in shares)	(294,203)	(237,294)
Forfeited (in shares)	(162,449)	(175,017)
Outstanding, end of period (in shares)	2,252,450	1,809,591
Grant date fair value (in CAD per share) | $	$ 112.49	$ 109.07

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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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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 2
-IssueDate 2023-01-01
-Paragraph 45
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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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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-IssueDate 2023-01-01
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The number of other equity instruments (ie other than share options) forfeited 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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-IssueDate 2023-01-01
-Paragraph 45
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_45&doctype=Standard
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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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