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Supplementary cash flow information - Net change in non-cash working capital (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021
Cash Flow Statement [Abstract] |  |
Accounts receivable | $ (47,789) | $ (42,336)
Work in progress | (116,260) | (12,354)
Prepaid expenses and other assets | (10,907) | (33,631)
Long-term financial assets | 22,929 | (10,241)
Accounts payable and accrued liabilities | 108,188 | 60,822
Accrued compensation and employee-related liabilities | (43,429) | 233,670
Deferred revenue | 43,656 | 62,307
Income taxes | (2,626) | 59,620
Provisions | (41,561) | (105,292)
Long-term liabilities | (28,074) | 1,535
Derivative financial instruments | (70) | (249)
Retirement benefits obligations | 5,050 | 1,013
Increase (decrease) in working capital | $ (110,893) | $ 214,864

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- Definition Adjustments for decrease (increase) in loans and advances to banks to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Loans and advances to banks; Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 20 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_20&doctype=Standard -URIDate 2021-03-24 + Details
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