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GOODWILL AND INTANGIBLES - Amortization Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 28, 2020
Mar. 30, 2019
Dec. 28, 2019
Business Acquisition [Line Items]      
Amortization expense $ 700 $ 400  
Estimated amortization expense      
2020 (nine months) 1,823    
2021 2,147    
2022 2,142    
2023 2,009    
2024 1,914    
2025 1,869    
Thereafter 10,889    
Total 22,793   $ 23,498
Summit Materials, LLC      
Business Acquisition [Line Items]      
Amortization expense 700 $ 400  
Estimated amortization expense      
2020 (nine months) 1,823    
2021 2,147    
2022 2,142    
2023 2,009    
2024 1,914    
2025 1,869    
Thereafter 10,889    
Total $ 22,793   $ 23,498