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Redeemable Noncontrolling Interest - Additional Information (Detail) - USD ($)
12 Months Ended
Jan. 02, 2016
May. 31, 2010
Redeemable Noncontrolling Interest [Line Items]    
Aggregate consideration for acquiring noncontrolling interests $ 497,848,000  
Common Class A [Member]    
Redeemable Noncontrolling Interest [Line Items]    
Class A common shares 1,029,183  
Continental Cement Company, L.L.C. [Member]    
Redeemable Noncontrolling Interest [Line Items]    
Aggregate consideration for acquiring noncontrolling interests $ 64,100  
Cash consideration 35,000,000  
Aggregate principal amount of non-interest bearing notes payable 15,000,000  
Annual installments amount of non-interest bearing notes payable $ 2,500,000  
Continental Cement Company, L.L.C. [Member] | Class A Units [Member]    
Redeemable Noncontrolling Interest [Line Items]    
Number of class units issued 100  
Economic interest of redeemable noncontrolling interest, approximately 70.00%  
Continental Cement Company, L.L.C. [Member] | Class B Units [Member]    
Redeemable Noncontrolling Interest [Line Items]    
Number of class units issued   100,000,000
Redeemable noncontrolling interest percentage, approximately   30.00%
Continental Cement Company, L.L.C. [Member] | Common Class A [Member]    
Redeemable Noncontrolling Interest [Line Items]    
Class A common shares 1,029,183  
Summit Materials, LLC [Member] | Continental Cement Company, L.L.C. [Member]    
Redeemable Noncontrolling Interest [Line Items]    
Aggregate consideration for acquiring noncontrolling interests $ 64,100,000  
Aggregate principal amount of non-interest bearing notes payable 15,000,000  
Annual installments amount of non-interest bearing notes payable 2,500,000  
Cash consideration $ 35,000,000  
Summit Materials, LLC [Member] | Continental Cement Company, L.L.C. [Member] | Class A Units [Member]    
Redeemable Noncontrolling Interest [Line Items]    
Number of class units issued 100  
Economic interest of redeemable noncontrolling interest, approximately 70.00%  
Summit Materials, LLC [Member] | Continental Cement Company, L.L.C. [Member] | Class B Units [Member]    
Redeemable Noncontrolling Interest [Line Items]    
Number of class units issued   100,000,000
Redeemable noncontrolling interest percentage, approximately   30.00%
Summit Materials, LLC [Member] | Continental Cement Company, L.L.C. [Member] | Common Class A [Member]    
Redeemable Noncontrolling Interest [Line Items]    
Class A common shares 1,029,183