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INVENTORIES
 9 Months Ended
Oct. 02, 2021
Inventory [Line Items]  
INVENTORIES INVENTORIES
 
Inventories consisted of the following as of October 2, 2021 and January 2, 2021: 
 October 2, 2021January 2, 2021
Aggregate stockpiles$132,325 $137,938 
Finished goods31,334 32,993 
Work in process9,189 9,281 
Raw materials22,464 20,096 
Total$195,312 $200,308 
Summit Materials, LLC  
Inventory [Line Items]  
INVENTORIES INVENTORIES
 
Inventories consisted of the following as of October 2, 2021 and January 2, 2021:
October 2, 2021January 2, 2021
Aggregate stockpiles$132,325 $137,938 
Finished goods31,334 32,993 
Work in process9,189 9,281 
Raw materials22,464 20,096 
Total$195,312 $200,308