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DEBT - Senior Secured Credit Facilities (Details) - Summit Materials, LLC - USD ($)
3 Months Ended
Feb. 25, 2019
Mar. 28, 2020
Dec. 28, 2019
Term Loan, due 2024      
Debt Instrument [Line Items]      
Debt instrument, face amount   $ 650,000,000.0  
Quarterly principal repayments percentage   0.25%  
Revolving Credit Facility      
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 345,000,000.0 $ 345,000,000.0  
Amount outstanding   0 $ 0
Remaining borrowing capacity   329,000,000.0  
Revolving Credit Facility | Federal funds rate      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.50%    
Revolving Credit Facility | LIBOR Plus 1%      
Debt Instrument [Line Items]      
Basis spread on variable rate 2.00%    
Percentage added to base rate 1.00%    
Revolving Credit Facility | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate 3.00%    
Letter of Credit      
Debt Instrument [Line Items]      
Amount outstanding   $ 16,000,000.0  
Senior Secured Credit Facilities      
Debt Instrument [Line Items]      
First lien leverage ratio 0.0475