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Supplementary cash flow information (Tables)
 12 Months Ended
Sep. 30, 2023
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:
2023 2022
$
$
 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 
16,465  (110,893)
Disclosure of non-cash operating and investing activities Non-cash operating and investing activities are as follows for the years ended September 30:
    2023 2022
$ $
 Operating activities
Accounts payable and accrued liabilities
 32,392  7,720 
Provisions
 1,088  262 
  Other long-term liabilities
 4,768  — 
38,248  7,982 
 Investing activities
Purchase of PP&E
 (14,374) (16,732)
Additions, disposals/retirements, change in estimates and lease modifications of right-of-use assets (86,691) (101,180)
Additions to intangible assets
 (28,944) (1,127)
(130,009) (119,039)
Disclosure of financing activities Changes arising from financing activities are as follows for the years ended September 30:
2023 2022
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 3,267,034  (146,215) 709,201  3,401,656  17,187  776,940 
Cash used in financing activities excluding equity
Increase of long-term debt 948  —  —  —  —  — 
Repayment of long-term debt and lease liabilities (79,150) —  (161,211) (401,654) —  (160,583)
Repayment of debt assumed in business acquisitions that occurred in prior year
 (56,994) —  —  (113,036) —  — 
Settlement of derivative financial instruments (Note 32)
 —  2,921  —  —  6,258  — 
Non-cash financing activities
Additions, disposals/retirements and change in estimates and lease modifications of right-of-use assets —  —  81,656  —  —  95,547 
Additions through business acquisitions (Note 27)
 —  —  —  162,640  —  23,181 
Changes in foreign currency exchange rates (38,218) 45,719  15,997  207,561  (169,660) (25,153)
Other 6,701  —  (3,680) 9,867  —  (731)
Balance, end of year 3,100,321  (97,575) 641,963  3,267,034  (146,215) 709,201 
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:
2023 2022
$ $
 Interest paid 130,570  115,408 
 Interest received 87,239  28,247 
 Income taxes paid 480,607  435,558