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Stock-Based Compensation - Summary of Award Activity (Details) - $ / shares
12 Months Ended
Jan. 02, 2021
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)  
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Options, Beginning balance (in shares) 2,128,107    
Options, Granted (in shares) 0 0 0
Options, Forfeited/Canceled (in shares) (35,117)    
Options, Exercised (in shares) (54,517)    
Options, Vested 0    
Options, Ending balance (in shares) 2,038,473 2,128,107  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]      
Options, Beginning balance (in dollars per share) $ 9.08    
Options, Granted (in dollars per share) 0    
Options, Forfeited/Canceled (in dollars per share) 12.30    
Options, Exercised (in dollars per share) 10.10    
Options, Vested (in dollars per share) 0    
Options, Ending balance (in dollars per share) $ 9.16 $ 9.08  
Stock Options | Summit Materials, LLC      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Options, Beginning balance (in shares) 2,128,107    
Options, Granted (in shares) 0 0 0
Options, Forfeited/Canceled (in shares) (35,117)    
Options, Exercised (in shares) (54,517)    
Options, Vested 0    
Options, Ending balance (in shares) 2,038,473 2,128,107  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]      
Options, Beginning balance (in dollars per share) $ 9.08    
Options, Granted (in dollars per share) 0    
Options, Forfeited/Canceled (in dollars per share) 12.30    
Options, Exercised (in dollars per share) 10.10    
Options, Vested (in dollars per share) 0    
Options, Ending balance (in dollars per share) $ 9.16 $ 9.08  
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) 1,556,636    
Number of units, granted (in shares) 1,379,943    
Number of units, Forfeited/Canceled (in shares) (154,283)    
Number of units, Exercised (in shares) 0    
Number of units, Vested (in shares) (647,345)    
Number of units, Ending balance (in shares) 2,134,951 1,556,636  
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) $ 20.29    
Number of units, Granted (in dollars per share) 18.10    
Number of units, Forfeited/Canceled (in dollars per share) 19.12    
Number of units, Exercised (in dollars per share) 0    
Number of units, Vested (in dollars per share) 21.28    
Number of units, Ending balance (in dollars per share) $ 18.64 $ 20.29  
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) 1,556,636    
Number of units, granted (in shares) 1,379,943    
Number of units, Forfeited/Canceled (in shares) (154,283)    
Number of units, Exercised (in shares) 0    
Number of units, Vested (in shares) (647,345)    
Number of units, Ending balance (in shares) 2,134,951 1,556,636  
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) $ 20.29    
Number of units, Granted (in dollars per share) 18.10    
Number of units, Forfeited/Canceled (in dollars per share) 19.12    
Number of units, Exercised (in dollars per share) 0    
Number of units, Vested (in dollars per share) 21.28    
Number of units, Ending balance (in dollars per share) $ 18.64 $ 20.29  
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) 390,645    
Number of units, granted (in shares) 199,946    
Number of units, Forfeited/Canceled (in shares) (112,416)    
Number of units, Exercised (in shares) 0    
Number of units, Vested (in shares) (49,300)    
Number of units, Ending balance (in shares) 428,875 390,645  
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) $ 31.08    
Number of units, Granted (in dollars per share) 23.43    
Number of units, Forfeited/Canceled (in dollars per share) 26.54    
Number of units, Exercised (in dollars per share) 0    
Number of units, Vested (in dollars per share) 32    
Number of units, Ending balance (in dollars per share) $ 28.64 $ 31.08  
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) 390,645    
Number of units, granted (in shares) 199,946    
Number of units, Forfeited/Canceled (in shares) (112,416)    
Number of units, Exercised (in shares) 0    
Number of units, Vested (in shares) (49,300)    
Number of units, Ending balance (in shares) 428,875 390,645  
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) $ 31.08    
Number of units, Granted (in dollars per share) 23.43    
Number of units, Forfeited/Canceled (in dollars per share) 26.54    
Number of units, Exercised (in dollars per share) 0    
Number of units, Vested (in dollars per share) 32    
Number of units, Ending balance (in dollars per share) $ 28.64 $ 31.08  
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