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Commitments, contingencies and guarantees - Guarantees (Details)
Sep. 30, 2024
CAD ($)
Disclosure of contingent liabilities [line items]  
Letters of credit in addition to the letters of credit covered by the unsecured committed revolving credit facility $ 72,249,000
Liability for refusal or failure to perform under bid and performance bonds | Guarantees  
Disclosure of contingent liabilities [line items]  
Estimated financial effect of guarantees $ 49,441,000