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DEBT - Senior Notes (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 15, 2019
Jun. 01, 2017
Jul. 08, 2015
Mar. 30, 2019
Jun. 29, 2019
Dec. 29, 2018
Debt Instrument [Line Items]            
Long-term debt         $ 1,873,627,000 $ 1,828,159,000
Write off of deferred financing fees         2,851,000  
8 1/2% Senior Notes, due 2022            
Debt Instrument [Line Items]            
Long-term debt         0 $ 250,000,000
Senior notes, interest rate (as a percent)           8.50%
5 1/8% Senior Notes, due 2025            
Debt Instrument [Line Items]            
Long-term debt         $ 300,000,000 $ 300,000,000
Senior notes, interest rate (as a percent)         5.125%  
6 1/8% Senior Notes, due 2023            
Debt Instrument [Line Items]            
Long-term debt         $ 649,012,000 648,891,000
Senior notes, interest rate (as a percent)         6.125%  
Issuers | 8 1/2% Senior Notes, due 2022            
Debt Instrument [Line Items]            
Senior notes, interest rate (as a percent)       8.50%    
Debt instrument, repurchased face amount       $ 250,000,000.0    
Debt instrument redemption charge       14,600,000    
Debt instrument, prepayment premium       11,700,000    
Write off of deferred financing fees       2,900,000    
Issuers | 5 1/8% Senior Notes, due 2025            
Debt Instrument [Line Items]            
Long-term debt   $ 300,000,000.0        
Senior notes, interest rate (as a percent)   5.125%        
Percentage of par value of senior notes   100.00%        
Proceeds net of related fees and expenses   $ 295,400,000        
Issuers | 6 1/8% Senior Notes, due 2023            
Debt Instrument [Line Items]            
Senior notes, interest rate (as a percent)     6.125%      
Debt instrument, face amount     $ 650,000,000.0      
Issuers | 6 1/8% Senior Notes, due 2023, issued at par            
Debt Instrument [Line Items]            
Debt instrument, face amount     $ 350,000,000.0      
Issuers | 6 1/8% Senior Notes, due 2023, issued at 99.375% of par            
Debt Instrument [Line Items]            
Percentage of par value of senior notes     99.375%      
Debt instrument, face amount     $ 300,000,000.0      
Summit Materials, LLC            
Debt Instrument [Line Items]            
Long-term debt         $ 1,873,627,000 1,828,159,000
Write off of deferred financing fees         $ 2,851,000  
Summit Materials, LLC | 6 1/2% Senior Notes, due 2027            
Debt Instrument [Line Items]            
Senior notes, interest rate (as a percent)         6.50%  
Debt instrument redemption charge       $ 14,600,000    
Summit Materials, LLC | 8 1/2% Senior Notes, due 2022            
Debt Instrument [Line Items]            
Long-term debt         $ 0 $ 250,000,000
Senior notes, interest rate (as a percent)       8.50%   8.50%
Debt instrument, repurchased face amount       $ 250,000,000.0    
Debt instrument, prepayment premium       11,700,000    
Write off of deferred financing fees       $ 2,900,000    
Summit Materials, LLC | 5 1/8% Senior Notes, due 2025            
Debt Instrument [Line Items]            
Long-term debt   $ 300,000,000.0     $ 300,000,000 $ 300,000,000
Senior notes, interest rate (as a percent)   5.125%     5.125%  
Summit Materials, LLC | 6 1/8% Senior Notes, due 2023            
Debt Instrument [Line Items]            
Long-term debt         $ 649,012,000 648,891,000
Senior notes, interest rate (as a percent)     6.125%   6.125%  
Debt instrument, face amount     $ 650,000,000.0      
Senior Notes | 6 1/2% Senior Notes, due 2027            
Debt Instrument [Line Items]            
Long-term debt         $ 300,000,000 0
Senior notes, interest rate (as a percent)         6.50%  
Senior Notes | Issuers | 6 1/2% Senior Notes, due 2027            
Debt Instrument [Line Items]            
Long-term debt $ 300,000,000.0          
Senior notes, interest rate (as a percent) 6.50%          
Percentage of par value of senior notes 100.00%          
Proceeds net of related fees and expenses $ 296,300,000          
Senior Notes | Summit Materials, LLC | 6 1/2% Senior Notes, due 2027            
Debt Instrument [Line Items]            
Long-term debt $ 300,000,000.0       $ 300,000,000 $ 0
Senior notes, interest rate (as a percent) 6.50%          
Percentage of par value of senior notes 100.00%          
Proceeds net of related fees and expenses $ 296,300,000