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GOODWILL AND INTANGIBLES - Amortization Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 29, 2019
Jun. 30, 2018
Jun. 29, 2019
Jun. 30, 2018
Dec. 29, 2018
Business Acquisition [Line Items]          
Amortization expense $ 400 $ 300 $ 800 $ 600  
Estimated amortization expense          
2019 (six months) 791   791    
2020 1,510   1,510    
2021 1,475   1,475    
2022 1,482   1,482    
2023 1,349   1,349    
2024 1,254   1,254    
Thereafter 9,792   9,792    
Total 17,653   17,653   $ 18,460
Summit Materials, LLC          
Business Acquisition [Line Items]          
Amortization expense 400 $ 300 800 $ 600  
Estimated amortization expense          
2019 (six months) 791   791    
2020 1,510   1,510    
2021 1,475   1,475    
2022 1,482   1,482    
2023 1,349   1,349    
2024 1,254   1,254    
Thereafter 9,792   9,792    
Total $ 17,653   $ 17,653   $ 18,460