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Long-term debt - Financing obligations (Details) - CAD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Oct. 01, 2023
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
MacKellar        
Debt Instrument [Line Items]        
Financing obligations $ 173,430      
Financing obligations, payments 73,657      
Financing obligations        
Debt Instrument [Line Items]        
Debt instrument related obligations       $ 233,668
Financing obligations, payments   $ 73,657    
Financing obligations | Financing Obligations Expiring Between August 2026 And September 2029        
Debt Instrument [Line Items]        
Debt instrument related obligations     $ 114,930  
Financing obligations | Minimum | Financing Obligations Expiring Between August 2026 And September 2029        
Debt Instrument [Line Items]        
Interest rate     5.56%  
Financing obligations | Minimum | Financing Obligations Expiring Between March 2024 And October 2028        
Debt Instrument [Line Items]        
Interest rate     1.99%  
Financing obligations | Minimum | Financing Obligations Expiring September 2029        
Debt Instrument [Line Items]        
Interest rate     6.72%  
Financing obligations | Maximum | Financing Obligations Expiring Between August 2026 And September 2029        
Debt Instrument [Line Items]        
Interest rate     7.92%  
Financing obligations | Maximum | Financing Obligations Expiring Between March 2024 And October 2028        
Debt Instrument [Line Items]        
Interest rate     8.11%  
Financing obligations | Maximum | Financing Obligations Expiring September 2029        
Debt Instrument [Line Items]        
Interest rate     7.17%  
Financing obligations | MacKellar        
Debt Instrument [Line Items]        
Financing obligations $ 173,430      
Equipment financing        
Debt Instrument [Line Items]        
Financing obligations   $ 162,266 $ 197,018 162,266
Financing obligations, payments     $ 77,363 $ 110,306