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LEASES - Future Minimum Lease Payments Under Topic 840 (Details)
$ in Thousands
Dec. 29, 2018
USD ($)
Lessee, Lease, Description [Line Items]  
2019 $ 9,479
2020 8,101
2021 6,701
2022 4,279
2023 3,411
Summit Materials, LLC  
Lessee, Lease, Description [Line Items]  
2019 9,479
2020 8,101
2021 6,701
2022 4,279
2023 $ 3,411