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INVENTORIES
 9 Months Ended
Sep. 26, 2020
Inventory [Line Items]  
INVENTORIES INVENTORIES
 
Inventories consisted of the following as of September 26, 2020 and December 28, 2019: 
 September 26, 2020December 28, 2019
Aggregate stockpiles$143,271 $140,461 
Finished goods31,657 33,023 
Work in process10,062 7,664 
Raw materials24,784 23,639 
Total$209,774 $204,787 
Summit Materials, LLC  
Inventory [Line Items]  
INVENTORIES INVENTORIES
 
Inventories consisted of the following as of September 26, 2020 and December 28, 2019:
September 26, 2020December 28, 2019
Aggregate stockpiles$143,271 $140,461 
Finished goods31,657 33,023 
Work in process10,062 7,664 
Raw materials24,784 23,639 
Total$209,774 $204,787