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Supplementary cash flow information (Tables)
 12 Months Ended
Sep. 30, 2024
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:
2024 2023
$
$
 Accounts receivable 106,360  (31,120)
 Work in progress (8,999) 76,554 
 Prepaid expenses and other assets 4,466  3,547 
 Long-term financial assets (24,423) (9,911)
 Accounts payable and accrued liabilities 22,151  (130,172)
 Accrued compensation and employee-related liabilities (27,689) (57,644)
 Deferred revenue 50,420  45,681 
 Income taxes (98,207) 105,577 
 Provisions (594) (10,129)
 Long-term liabilities 33,540  18,893 
 Derivative financial instruments 634  (682)
 Retirement benefits obligations 7,337  5,871 
64,996  16,465 
Disclosure of non-cash operating and investing activities Non-cash operating and investing activities are as follows for the years ended September 30:
    2024 2023
$ $
 Operating activities
Accounts receivable
 (12) — 
Accounts payable and accrued liabilities
 35,992  32,392 
Provisions
 576  1,088 
  Other long-term liabilities
 13,524  4,768 
50,080  38,248 
 Investing activities
Purchase of PP&E
 (11,158) (14,374)
Additions, disposals/retirements, change in estimates and lease modifications of right-of-use assets (110,778) (86,691)
Additions to intangible assets
 (40,908) (28,944)
(162,844) (130,009)
Disclosure of financing activities Changes arising from financing activities are as follows for the years ended September 30:
2024 2023
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 3,100,321  (97,575) 641,963  3,267,034  (146,215) 709,201 
Cash used in financing activities excluding equity
Increase of long-term debt 747,073  —  —  948  —  — 
Repayment of long-term debt and lease liabilities (1,154,878) —  (146,762) (79,150) —  (161,211)
Repayment of debt assumed in business acquisitions that occurred in prior year
 (162,146) —  —  (56,994) —  — 
Settlement of derivative financial instruments (Note 32)
 —  38,943  —  —  2,921  — 
Non-cash financing activities
Additions, disposals/retirements and change in estimates and lease modifications of right-of-use assets —  —  110,778  —  —  81,656 
Additions through business acquisitions (Note 27)
 162,146  —  2,341  —  —  — 
Changes in foreign currency exchange rates (6,715) 68,132  18,914  (38,218) 45,719  15,997 
Other 2,507  —  (7,139) 6,701  —  (3,680)
Balance, end of year 2,688,308  9,500  620,095  3,100,321  (97,575) 641,963 
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:
2024 2023
$ $
 Interest paid 102,180  130,570 
 Interest received 87,153  87,239 
 Income taxes paid 740,325  480,607