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Business acquisitions - Narrative (Details) - CAD ($)
 3 Months Ended 12 Months Ended
Oct. 01, 2023
Dec. 31, 2022
Oct. 01, 2022
Dec. 31, 2023
Dec. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
MacKellar              
Finite-Lived Intangible Assets [Line Items]              
Percentage of business acquired 100.00%            
Total consideration transferred $ 179,668,000            
Financing obligations, payments 73,657,000       $ 73,657,000 $ 73,657,000  
Finance lease obligations, payments 18,509,000       18,509,000    
Accounts receivable 65,033,000            
Property, plant and equipment 394,394,000            
Revenue       $ 122,519,000      
Revenue percentage       12.80%      
Net income       $ 13,946,000      
Net income percentage       22.10%      
Acquisition related costs           7,095,000  
Total consideration transferred 383,614,000            
Assumed lease liabilities 30,516,000            
Cash consideration $ 65,572,000            
Deferred consideration related to acquisition   $ 0   $ 20,070,000 20,070,000 20,070,000 $ 0
MLN              
Finite-Lived Intangible Assets [Line Items]              
Percentage of business acquired     100.00%        
Accounts receivable     $ 4,068,000        
Property, plant and equipment     9,562,000        
Revenue             5,224,000
Net income             1,094,000
Acquisition related costs             95,000
Total consideration transferred     8,002,000        
Property, plant and equipment and working capital     13,723,000        
Assumed lease liabilities     $ 5,721,000        
Cash consideration   3,000,000          
Deferred consideration related to acquisition   $ 5,002,000   $ 0 $ 0 0 $ 5,002,000
Deferred consideration paid           $ 5,002,000