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Supplementary cash flow information - Net change in non-cash working capital (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
Cash Flow Statement [Abstract] |  |
Accounts receivable | $ (31,120) | $ (33,703)
Work in progress | 76,554 | (116,260)
Prepaid expenses and other assets | 3,547 | (10,907)
Long-term financial assets | (9,911) | 8,843
Accounts payable and accrued liabilities | (130,172) | 108,188
Accrued compensation and employee-related liabilities | (57,644) | (43,429)
Deferred revenue | 45,681 | 43,656
Income taxes | 105,577 | (2,626)
Provisions | (10,129) | (41,561)
Long-term liabilities | 18,893 | (28,074)
Derivative financial instruments | (682) | (70)
Retirement benefits obligations | 5,871 | 5,050
Increase (decrease) in working capital | $ 16,465 | $ (110,893)

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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 2023-01-01 -Paragraph 20 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&anchor=para_20&doctype=Standard -URIDate 2023-03-23 + Details
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