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Supplementary cash flow information - Non-cash operating and investing activities (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Operating activities    
Accounts payable and accrued liabilities $ 7,720 $ 18,707
Provisions 262 805
Non-cash operating activities 7,982 19,512
Investing activities    
Purchase of PP&E (16,732) (18,162)
Additions, disposals/retirements, change in estimates and lease modifications of right-of-use assets (101,180) (104,467)
Additions to intangible assets (1,127) (1,350)
Non-cash investing activities $ (119,039) $ (123,979)