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Income taxes - Disclosure of income tax expense (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021
Current income tax expense |  |
Current income tax expense in respect of the current year | $ 506,608 | $ 475,833
Adjustments recognized in the current year in relation to the income tax expense of prior years | 1,705 | 19,021
Total current income tax expense | 508,313 | 494,854
Deferred income tax recovery |  |
Deferred income tax expense (recovery) relating to the origination and reversal of temporary differences | 359 | (6,165)
Deferred income tax recovery relating to changes in tax rates | 0 | (460)
Adjustments recognized in the current year in relation to the deferred income tax recovery of prior years | (7,855) | (19,309)
Total deferred income tax recovery | (7,496) | (25,934)
Total income tax expense | $ 500,817 | $ 468,920

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- Definition Adjustments of tax expense (income) recognised in the period for current tax of prior periods. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2021-01-01 -Paragraph 80 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_80_b&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition Adjustments of tax expense (income) recognised in the period for the deferred tax of prior periods. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2021-01-01 -Paragraph 80 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_80&doctype=Standard -URIDate 2021-03-24 + Details
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