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Stock-Based Compensation - Summary of Award Activity (Details)
12 Months Ended
Dec. 29, 2018
$ / shares
shares
Options  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Options, Beginning balance (in shares) 4,153,613
Options, Granted (in shares) 0
Options, Forfeited (in shares) (22,566)
Options, Exercised (in shares) (863,898)
Options, Ending balance (in shares) 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) | $ / shares $ 9.13
Options, Granted (in dollars per share) | $ / shares 0.00
Options, Forfeited (in dollars per share) | $ / shares 10.91
Options, Exercised (in dollars per share) | $ / shares 8.88
Options, Ending balance (in dollars per share) | $ / shares $ 9.09
Options | Summit Materials, LLC  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Options, Beginning balance (in shares) 4,153,613
Options, Granted (in shares) 0
Options, Forfeited (in shares) (22,566)
Options, Exercised (in shares) (863,898)
Options, Ending balance (in shares) 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) | $ / shares $ 9.13
Options, Granted (in dollars per share) | $ / shares 0.00
Options, Forfeited (in dollars per share) | $ / shares 10.91
Options, Exercised (in dollars per share) | $ / shares 8.88
Options, Ending balance (in dollars per share) | $ / shares $ 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) 508,586
Number of units, granted (in shares) 689,386
Number of units, Forfeited (in shares) (21,551)
Number of units, Exercised (in shares) 0
Number of units, Vested (in shares) (252,113)
Number of units, Ending balance (in shares) 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) | $ / shares $ 20.14
Number of units, Granted (in dollars per share) | $ / shares 28.68
Number of units, Forfeited (in dollars per share) | $ / shares 28.11
Number of units, Exercised (in dollars per share) | $ / shares 0.00
Number of units, Vested (in dollars per share) | $ / shares 21.95
Number of units, Ending balance (in dollars per share) | $ / shares $ 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) 508,586
Number of units, granted (in shares) 689,386
Number of units, Forfeited (in shares) (21,551)
Number of units, Vested (in shares) (252,113)
Number of units, Ending balance (in shares) 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) | $ / shares $ 20.14
Number of units, Granted (in dollars per share) | $ / shares 28.68
Number of units, Forfeited (in dollars per share) | $ / shares 28.11
Number of units, Vested (in dollars per share) | $ / shares 21.95
Number of units, Ending balance (in dollars per share) | $ / shares $ 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) 211,455
Number of units, granted (in shares) 102,842
Number of units, Forfeited (in shares) (19,045)
Number of units, Exercised (in shares) 0
Number of units, Vested (in shares) 0
Number of units, Ending balance (in shares) 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) | $ / shares $ 23.69
Number of units, Granted (in dollars per share) | $ / shares 40.83
Number of units, Forfeited (in dollars per share) | $ / shares 26.26
Number of units, Exercised (in dollars per share) | $ / shares 0.00
Number of units, Vested (in dollars per share) | $ / shares 0.00
Number of units, Ending balance (in dollars per share) | $ / shares $ 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) 211,455
Number of units, granted (in shares) 102,842
Number of units, Forfeited (in shares) (19,045)
Number of units, Ending balance (in shares) 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) | $ / shares $ 23.69
Number of units, Granted (in dollars per share) | $ / shares 40.83
Number of units, Forfeited (in dollars per share) | $ / shares 26.26
Number of units, Ending balance (in dollars per share) | $ / shares $ 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) 102,778
Number of units, granted (in shares) 0
Number of units, Forfeited (in shares) 0
Number of units, Exercised (in shares) (2,741)
Number of units, Vested (in shares) 0
Number of units, Ending balance (in shares) 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) | $ / shares $ 18.00
Number of units, Exercised (in dollars per share) | $ / shares 18.00
Number of units, Ending balance (in dollars per share) | $ / shares $ 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) 102,778
Number of units, Exercised (in shares) (2,741)
Number of units, Ending balance (in shares) 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) | $ / shares $ 18.00
Number of units, Exercised (in dollars per share) | $ / shares 18.00
Number of units, Ending balance (in dollars per share) | $ / shares $ 18.00