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Summary of Organization and Significant Accounting Policies - New Accounting Standards (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Dec. 30, 2018
New Accounting Standards        
Other (income) loss, net $ (15,516) $ (5,303) $ 1,361  
General and administrative expenses (253,609) (242,670) (243,512)  
Summit Materials, LLC        
New Accounting Standards        
Other (income) loss, net (15,516) (5,289) 1,374  
General and administrative expenses $ (253,609) $ (242,670) $ (243,512)  
Minimum | Scenario, Forecast | Accounting Standards Update 2016-02        
New Accounting Standards        
Right-of-use asset and liability       $ 30,000
Maximum | Scenario, Forecast | Accounting Standards Update 2016-02        
New Accounting Standards        
Right-of-use asset and liability       $ 40,000