v3.22.4
Debt - Other Narrative (Details)
Jan. 15, 2015
USD ($)
Dec. 31, 2022
USD ($)
Jan. 01, 2022
USD ($)
Jan. 15, 2015
CAD ($)
Canadian Subsidiary Credit Agreement        
Debt        
Amount outstanding   $ 0 $ 0  
Canadian Subsidiary Credit Agreement | Summit Materials, LLC        
Debt        
Amount outstanding   $ 0 $ 0  
Canadian Subsidiary Credit Agreement, Operating Activities        
Debt        
Revolving credit commitment       $ 6,000,000
Canadian Subsidiary Credit Agreement, Operating Activities | Summit Materials, LLC        
Debt        
Revolving credit commitment $ 6,000,000      
Canadian Subsidiary Credit Agreement, Capital Equipment        
Debt        
Revolving credit commitment       500,000
Canadian Subsidiary Credit Agreement, Capital Equipment | Summit Materials, LLC        
Debt        
Revolving credit commitment 500,000      
Canadian Subsidiary Credit Agreement, Guarantees        
Debt        
Revolving credit commitment       1,500,000
Canadian Subsidiary Credit Agreement, Guarantees | Summit Materials, LLC        
Debt        
Revolving credit commitment 1,500,000      
Canadian Subsidiary Credit Agreement, Foreign Exchange Facility        
Debt        
Revolving credit commitment       $ 10,000,000
Canadian Subsidiary Credit Agreement, Foreign Exchange Facility | Summit Materials, LLC        
Debt        
Revolving credit commitment $ 10,000,000      
Prime rate | Canadian Subsidiary Credit Agreement, Operating Activities        
Debt        
Basis spread on variable rate 0.20%      
Prime rate | Canadian Subsidiary Credit Agreement, Operating Activities | Summit Materials, LLC        
Debt        
Basis spread on variable rate 0.20%      
Prime rate | Canadian Subsidiary Credit Agreement, Capital Equipment        
Debt        
Basis spread on variable rate 0.20%      
Prime rate | Canadian Subsidiary Credit Agreement, Capital Equipment | Summit Materials, LLC        
Debt        
Basis spread on variable rate 0.20%