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Debt - Senior Secured Credit Facilities (Details) - Summit Materials, LLC - USD ($)
12 Months Ended
Feb. 25, 2019
Jan. 02, 2021
Dec. 28, 2019
Term Loan, due 2024:      
Debt      
Debt instrument, face amount   $ 650,000,000.0  
Revolving Credit Facility      
Debt      
Maximum borrowing capacity $ 345,000,000.0 $ 345,000,000.0  
Basis spread on variable rate   0.25%  
Amount outstanding   $ 0 $ 0
Remaining borrowing capacity   329,100,000  
Revolving Credit Facility | Federal funds rate      
Debt      
Basis spread on variable rate 0.50%    
Revolving Credit Facility | LIBOR Plus 1%      
Debt      
Basis spread on variable rate 2.00%    
Percentage added to base rate 1.00%    
Revolving Credit Facility | LIBOR      
Debt      
Basis spread on variable rate 3.00%    
Letter of Credit      
Debt      
Amount outstanding   $ 15,900,000  
Senior Secured Credit Facilities      
Debt      
First lien leverage ratio   4.75