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Accumulated Other Comprehensive Loss - Summary of Changes in Each Component of Accumulated Comprehensive Income Loss (Detail) - Summit Materials, LLC [Member] - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jul. 02, 2016
Jun. 27, 2015
Jan. 02, 2016
Dec. 27, 2014
Dec. 28, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Beginning balance $ (28,466) $ (15,546) $ (15,546)    
Postretirement adjustment     2,123 $ (3,919) $ 4,407
Foreign currency translation adjustment 5,277 (5,235) (14,099) (5,816)  
Loss on cash flow hedges (3,292)   (944)    
Ending balance (26,481)   (28,466) (15,546)  
Change in Retirement Plans [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Beginning balance (7,607) (9,730) (9,730) (6,045) (9,130)
Ending balance     (7,607) (9,730) (6,045)
Change in Retirement Plans [Member] | Postretirement Curtailment Adjustment [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Postretirement adjustment       (942)  
Change in Retirement Plans [Member] | Postretirement Liability Adjustment [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Postretirement adjustment     2,123 (2,743) 3,085
Foreign Currency Translation Adjustments [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Beginning balance (19,915) (5,816) (5,816)    
Foreign currency translation adjustment     (14,099) (5,816)  
Ending balance     (19,915) (5,816)  
Cash Flow Hedge Adjustments [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Beginning balance (944)        
Loss on cash flow hedges     (944)    
Ending balance     (944)    
Accumulated Other Comprehensive Loss (AOCI) [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Beginning balance $ (28,466) $ (15,546) (15,546) (6,045) (9,130)
Foreign currency translation adjustment     (14,099) (5,816)  
Loss on cash flow hedges     (944)    
Ending balance     (28,466) (15,546) (6,045)
Accumulated Other Comprehensive Loss (AOCI) [Member] | Postretirement Curtailment Adjustment [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Postretirement adjustment       (942)  
Accumulated Other Comprehensive Loss (AOCI) [Member] | Postretirement Liability Adjustment [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Postretirement adjustment     $ 2,123 $ (2,743) $ 3,085