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Share-based payments - Disclosure of information concerning PSUs (Details)	12 Months Ended
	Sep. 30, 2024 CAD ($) shares	Sep. 30, 2023 CAD ($) shares
PSUs
Disclosure of terms and conditions of share-based payment arrangement [line items]
Outstanding, beginning of period (in shares)	2,252,450	1,809,591
Granted (in shares)	799,418	899,511
Exercised (in shares)	(280,265)	(294,203)
Forfeited (in shares)	(243,403)	(162,449)
Outstanding, end of period (in shares)	2,528,200	2,252,450
Grant date fair value (in CAD per share) | $	$ 137.90	$ 112.49
RSUs
Disclosure of terms and conditions of share-based payment arrangement [line items]
Outstanding, end of period (in shares)	0

X

- Definition

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.

+ References

No definition available.

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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 2024-01-01
-Paragraph 45
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_45&doctype=Standard
-URIDate 2024-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2024-01-01
-Paragraph 47
-Subparagraph b
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- Definition

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

+ References

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-Name IFRS
-Number 2
-IssueDate 2024-01-01
-Paragraph 45
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_45&doctype=Standard
-URIDate 2024-03-27

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- Definition

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

+ References

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-Name IFRS
-Number 2
-IssueDate 2024-01-01
-Paragraph 45
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_45&doctype=Standard
-URIDate 2024-03-27

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 2
-IssueDate 2024-01-01
-Paragraph 45
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_45&doctype=Standard
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- Definition

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

+ References

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-Name IFRS
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-IssueDate 2024-01-01
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