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Stock-Based Compensation - Summary of Award Activity (Details) - $ / shares
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Options, Exercised (in shares) (1,065,446) (863,898)
Options    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Options, Beginning balance (in shares) 3,267,149  
Options, Granted (in shares) 0 0
Options, Forfeited/Canceled (in shares) (73,596)  
Options, Exercised (in shares) (1,065,446)  
Options, Vested 0  
Options, Ending balance (in shares) 2,128,107 3,267,149
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Options, Beginning balance (in dollars per share) $ 9.09  
Options, Granted (in dollars per share) 0  
Options, Forfeited/Canceled (in dollars per share) 10.62  
Options, Exercised (in dollars per share) 8.93  
Options, Vested (in dollars per share) 0  
Options, Ending balance (in dollars per share) $ 9.08 $ 9.09
Options | Summit Materials, LLC    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Options, Beginning balance (in shares) 3,267,149  
Options, Granted (in shares) 0 0
Options, Forfeited/Canceled (in shares) (73,596)  
Options, Exercised (in shares) (1,065,446)  
Options, Vested 0  
Options, Ending balance (in shares) 2,128,107 3,267,149
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Options, Beginning balance (in dollars per share) $ 9.09  
Options, Granted (in dollars per share) 0  
Options, Forfeited/Canceled (in dollars per share) 10.62  
Options, Exercised (in dollars per share) 8.93  
Options, Vested (in dollars per share) 0  
Options, Ending balance (in dollars per share) $ 9.08 $ 9.09
Restricted stock    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Number of units, Beginning balance (in shares) 924,308  
Number of units, granted (in shares) 1,238,530  
Number of units, Forfeited/Canceled (in shares) (176,152)  
Number of units, Exercised (in shares) 0  
Number of units, Vested (in shares) (430,050)  
Number of units, Ending balance (in shares) 1,556,636 924,308
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Number of units, Beginning balance (in dollars per share) $ 24.57  
Number of units, Granted (in dollars per share) 17.60  
Number of units, Forfeited/Canceled (in dollars per share) 22.21  
Number of units, Exercised (in dollars per share) 0  
Number of units, Vested (in dollars per share) 23.71  
Number of units, Ending balance (in dollars per share) $ 21.17 $ 24.57
Restricted stock | Summit Materials, LLC    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Number of units, Beginning balance (in shares) 924,308  
Number of units, granted (in shares) 1,238,530  
Number of units, Forfeited/Canceled (in shares) (176,152)  
Number of units, Exercised (in shares) 0  
Number of units, Vested (in shares) (430,050)  
Number of units, Ending balance (in shares) 1,556,636 924,308
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Number of units, Beginning balance (in dollars per share) $ 24.57  
Number of units, Granted (in dollars per share) 17.60  
Number of units, Forfeited/Canceled (in dollars per share) 22.21  
Number of units, Exercised (in dollars per share) 0  
Number of units, Vested (in dollars per share) 23.71  
Number of units, Ending balance (in dollars per share) $ 21.17 $ 24.57
Performance Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Number of units, Beginning balance (in shares) 295,252  
Number of units, granted (in shares) 242,007  
Number of units, Forfeited/Canceled (in shares) (146,614)  
Number of units, Exercised (in shares) 0  
Number of units, Vested (in shares) 0  
Number of units, Ending balance (in shares) 390,645 295,252
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Number of units, Beginning balance (in dollars per share) $ 29.12  
Number of units, Granted (in dollars per share) 26.20  
Number of units, Forfeited/Canceled (in dollars per share) 20.17  
Number of units, Exercised (in dollars per share) 0  
Number of units, Vested (in dollars per share) 0  
Number of units, Ending balance (in dollars per share) $ 26.17 $ 29.12
Performance Stock Units | Summit Materials, LLC    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Number of units, Beginning balance (in shares) 295,252  
Number of units, granted (in shares) 242,007  
Number of units, Forfeited/Canceled (in shares) (146,614)  
Number of units, Exercised (in shares) 0  
Number of units, Vested (in shares) 0  
Number of units, Ending balance (in shares) 390,645 295,252
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Number of units, Beginning balance (in dollars per share) $ 29.12  
Number of units, Granted (in dollars per share) 26.20  
Number of units, Forfeited/Canceled (in dollars per share) 20.17  
Number of units, Exercised (in dollars per share) 0  
Number of units, Vested (in dollars per share) 0  
Number of units, Ending balance (in dollars per share) $ 26.17 $ 29.12
Warrants    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Number of units, Beginning balance (in shares) 100,037  
Number of units, granted (in shares) 0  
Number of units, Forfeited/Canceled (in shares) 0  
Number of units, Exercised (in shares) 0  
Number of units, Vested (in shares) 0  
Number of units, Ending balance (in shares) 100,037 100,037
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Number of units, Beginning balance (in dollars per share) $ 18.00  
Number of units, Granted (in dollars per share) 0  
Number of units, Forfeited/Canceled (in dollars per share) 0  
Number of units, Exercised (in dollars per share) 0  
Number of units, Vested (in dollars per share) 0  
Number of units, Ending balance (in dollars per share) $ 18.00 $ 18.00
Warrants | Summit Materials, LLC    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Number of units, Beginning balance (in shares) 100,037  
Number of units, granted (in shares) 0  
Number of units, Forfeited/Canceled (in shares) 0  
Number of units, Exercised (in shares) 0  
Number of units, Vested (in shares) 0  
Number of units, Ending balance (in shares) 100,037 100,037
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Number of units, Beginning balance (in dollars per share) $ 18.00  
Number of units, Granted (in dollars per share) 0  
Number of units, Forfeited/Canceled (in dollars per share) 0  
Number of units, Exercised (in dollars per share) 0  
Number of units, Vested (in dollars per share) 0  
Number of units, Ending balance (in dollars per share) $ 18.00 $ 18.00