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Supplementary cash flow information - Financing activities (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Cash used in financing activities excluding equity    
Repayment of debt assumed in business acquisitions $ (113,036) $ 0
Settlement of derivative financial instruments 6,258 (6,992)
Non-cash financing activities    
Additions, disposals/retirements, change in estimates and lease modifications of right-of-use assets 101,180 104,467
Long-term debt    
Financing activities    
Balance, beginning of year 3,401,656 3,587,095
Cash used in financing activities excluding equity    
Increase of long-term debt 0 1,885,262
Repayment of long-term debt and lease liabilities (401,654) (1,888,777)
Repayment of debt assumed in business acquisitions (113,036) 0
Settlement of derivative financial instruments 0 0
Non-cash financing activities    
Additions, disposals/retirements, change in estimates and lease modifications of right-of-use assets 0 0
Additions through business acquisitions (Note 26) 162,640 0
Changes in foreign currency exchange rates 207,561 (172,984)
Other 9,867 (8,940)
Balance, end of year 3,267,034 3,401,656
Derivative financial instruments to hedge long-term debt    
Financing activities    
Balance, beginning of year 17,187 32,234
Cash used in financing activities excluding equity    
Increase of long-term debt 0 0
Repayment of long-term debt and lease liabilities 0 0
Repayment of debt assumed in business acquisitions 0 0
Settlement of derivative financial instruments 6,258 (6,992)
Non-cash financing activities    
Additions, disposals/retirements, change in estimates and lease modifications of right-of-use assets 0 0
Additions through business acquisitions (Note 26) 0 0
Changes in foreign currency exchange rates (169,660) (8,055)
Other 0 0
Balance, end of year (146,215) 17,187
Lease liabilities    
Financing activities    
Balance, beginning of year 776,940 876,370
Cash used in financing activities excluding equity    
Increase of long-term debt 0 0
Repayment of long-term debt and lease liabilities (160,583) (174,808)
Repayment of debt assumed in business acquisitions 0 0
Settlement of derivative financial instruments 0 0
Non-cash financing activities    
Additions, disposals/retirements, change in estimates and lease modifications of right-of-use assets 95,547 102,281
Additions through business acquisitions (Note 26) 23,181 5,733
Changes in foreign currency exchange rates (25,153) (30,721)
Other (731) (1,915)
Balance, end of year $ 709,201 $ 776,940