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Inventories - Components of Inventories (Details) - USD ($)
$ in Thousands
Jan. 01, 2022
Jan. 02, 2021
Inventory [Line Items]    
Aggregate stockpiles $ 130,640 $ 137,938
Finished goods 22,690 32,993
Work in process 8,277 9,281
Raw materials 19,153 20,096
Total 180,760 200,308
Summit Materials, LLC    
Inventory [Line Items]    
Aggregate stockpiles 130,640 137,938
Finished goods 22,690 32,993
Work in process 8,277 9,281
Raw materials 19,153 20,096
Total $ 180,760 $ 200,308