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GOODWILL AND INTANGIBLES - Amortization Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 28, 2019
Sep. 29, 2018
Sep. 28, 2019
Sep. 29, 2018
Dec. 29, 2018
Business Acquisition [Line Items]          
Amortization expense $ 600 $ 500 $ 1,400 $ 1,100  
Estimated amortization expense          
2019 (three months) 711   711    
2020 2,552   2,552    
2021 2,164   2,164    
2022 2,168   2,168    
2023 2,035   2,035    
2024 1,940   1,940    
Thereafter 12,876   12,876    
Total 24,446   24,446   $ 18,460
Summit Materials, LLC          
Business Acquisition [Line Items]          
Amortization expense 600 $ 500 1,400 $ 1,100  
Estimated amortization expense          
2019 (three months) 711   711    
2020 2,552   2,552    
2021 2,164   2,164    
2022 2,168   2,168    
2023 2,035   2,035    
2024 1,940   1,940    
Thereafter 12,876   12,876    
Total $ 24,446   $ 24,446   $ 18,460