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Income taxes - Disclosure of income tax expense (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Current income tax expense |  |
Current income tax expense in respect of the current year | $ 697,402 | $ 506,608
Adjustments recognized in the current year in relation to the income tax expense of prior years | (21,242) | 1,705
Total current income tax expense | 676,160 | 508,313
Deferred income tax recovery |  |
Deferred income tax (recovery) expense relating to the origination and reversal of temporary differences | (119,249) | 359
Adjustments recognized in the current year in relation to the deferred income tax recovery of prior years | 9,753 | (7,855)
Total deferred income tax recovery | (109,496) | (7,496)
Total income tax expense | $ 566,664 | $ 500,817

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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 2023-01-01 -Paragraph 80 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_80_b&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2023-01-01 -Paragraph 80 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_80_a&doctype=Standard -URIDate 2023-03-23 + Details
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