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Supplementary cash flow information - Net change in non-cash working capital (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024
Cash Flow Statement [Abstract] |  |
Accounts receivable | $ 80,109 | $ 106,360
Work in progress | (63,386) | (8,999)
Prepaid expenses and other assets | 49,158 | 4,466
Long-term financial assets | (9,329) | (24,423)
Accounts payable and accrued liabilities | (167,764) | 22,151
Accrued compensation and employee-related liabilities | (59,885) | (27,689)
Deferred revenue | (1,932) | 50,420
Income taxes | (85,430) | (98,207)
Provisions | 122,426 | (594)
Long-term liabilities | 7,739 | 33,540
Derivative financial instruments | 118 | 634
Retirement benefits obligations | 9,133 | 7,337
Increase (decrease) in working capital | $ (119,043) | $ 64,996

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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 2025-01-01 -Paragraph 20 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_20&doctype=Standard -URIDate 2025-03-27 + Details
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