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Supplementary cash flow information (Tables)
 12 Months Ended
Sep. 30, 2025
Cash Flow Statement [Abstract]  
Disclosure of net change in non-cash working capital Net change in non-cash working capital items and others is as follows for the years ended September 30:
2025 2024
$
$
 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 
(119,043) 64,996 
Disclosure of non-cash operating and investing activities Non-cash operating and investing activities are as follows for the years ended September 30:
    2025 2024
$ $
 Operating activities
Accounts receivable
 —  (12)
Accounts payable and accrued liabilities
 45,269  35,992 
Provisions
 1,219  576 
  Other long-term liabilities
 19,401  13,524 
65,889  50,080 
 Investing activities
Purchase of PP&E
 (12,021) (11,158)
Additions, disposals/retirements, change in estimates and lease modifications of right-of-use assets (143,914) (110,778)
Additions to intangible assets
 (59,927) (40,908)
(215,862) (162,844)
Disclosure of financing activities Changes arising from financing activities are as follows for the years ended September 30:
2025 2024
Long-term debt Derivative financial instruments to hedge long-term debt Lease liabilities Long-term debt Derivative financial instruments to hedge long-term debt Lease liabilities
$ $ $ $ $ $
Balance, beginning of year 2,688,308  9,500  620,095  3,100,321  (97,575) 641,963 
Cash used in financing activities excluding equity
Increase of long-term debt 923,922  —  —  747,073  —  — 
Repayment of long-term debt and lease liabilities —  —  (177,465) (1,154,878) —  (146,762)
Repayment of debt assumed in business acquisitions (47,953) —  —  (162,146) —  — 
Settlement of derivative financial instruments (Note 32)
 —  —  —  —  38,943  — 
Non-cash financing activities
Additions, disposals/retirements and change in estimates
and lease modifications of right-of-use assets
 —  —  144,967  —  —  110,778 
Additions through business acquisitions (Note 27)
 58,376  —  69,771  162,146  —  2,341 
Changes in foreign currency exchange rates 13,623  128,285  32,319  (6,715) 68,132  18,914 
Other 1,559  —  3,797  2,507  —  (7,139)
Balance, end of year 3,637,835  137,785  693,484  2,688,308  9,500  620,095 
Disclosure of interest and income taxes paid and received Interest paid and received and income taxes paid are classified within operating activities and are as follows for the years ended September 30:
2025 2024
$ $
 Interest paid 129,133  102,180 
 Interest received 62,604  87,153 
 Income taxes paid 603,370  740,325