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Supplementary cash flow information - Financing activities (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash used in financing activities excluding equity    
Repayment of debt assumed in business acquisitions that occurred in prior year $ (56,994) $ (113,036)
Settlement of derivative financial instruments 2,921 6,258
Non-cash financing activities    
Additions, disposals/retirements, change in estimates and lease modifications of right-of-use assets 86,691 101,180
Long-term debt    
Financing activities    
Balance, beginning of year 3,267,034 3,401,656
Cash used in financing activities excluding equity    
Increase of long-term debt 948 0
Repayment of long-term debt and lease liabilities (79,150) (401,654)
Repayment of debt assumed in business acquisitions that occurred in prior year (56,994) (113,036)
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 27) 0 162,640
Changes in foreign currency exchange rates (38,218) 207,561
Other 6,701 9,867
Balance, end of year 3,100,321 3,267,034
Derivative financial instruments to hedge long-term debt    
Financing activities    
Balance, beginning of year (146,215) 17,187
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 that occurred in prior year 0 0
Settlement of derivative financial instruments 2,921 6,258
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 27) 0 0
Changes in foreign currency exchange rates 45,719 (169,660)
Other 0 0
Balance, end of year (97,575) (146,215)
Lease liabilities    
Financing activities    
Balance, beginning of year 709,201 776,940
Cash used in financing activities excluding equity    
Increase of long-term debt 0 0
Repayment of long-term debt and lease liabilities (161,211) (160,583)
Repayment of debt assumed in business acquisitions that occurred in prior year 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 81,656 95,547
Additions through business acquisitions (Note 27) 0 23,181
Changes in foreign currency exchange rates 15,997 (25,153)
Other (3,680) (731)
Balance, end of year $ 641,963 $ 709,201