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ACQUISITIONS, DISPOSTIONS, GOODWILL AND INTANGIBLES - Summary of Goodwill by Reportable Segments (Details)
$ in Thousands
6 Months Ended
Jul. 02, 2022
USD ($)
Goodwill [Roll Forward]  
Balance—January 1, 2022 $ 1,163,750
Dispositions (18,095)
Foreign currency translation adjustments (1,373)
Balance—July 2, 2022 1,144,282
West  
Goodwill [Roll Forward]  
Balance—January 1, 2022 570,509
Dispositions 0
Foreign currency translation adjustments (1,373)
Balance—July 2, 2022 569,136
East  
Goodwill [Roll Forward]  
Balance—January 1, 2022 388,585
Dispositions (18,095)
Foreign currency translation adjustments 0
Balance—July 2, 2022 370,490
Cement  
Goodwill [Roll Forward]  
Balance—January 1, 2022 204,656
Dispositions 0
Foreign currency translation adjustments 0
Balance—July 2, 2022 204,656
Summit Materials, LLC  
Goodwill [Roll Forward]  
Balance—January 1, 2022 1,164,750
Dispositions (18,095)
Foreign currency translation adjustments (1,373)
Balance—July 2, 2022 1,145,282
Summit Materials, LLC | West  
Goodwill [Roll Forward]  
Balance—January 1, 2022 571,509
Dispositions 0
Foreign currency translation adjustments (1,373)
Balance—July 2, 2022 570,136
Summit Materials, LLC | East  
Goodwill [Roll Forward]  
Balance—January 1, 2022 388,585
Dispositions (18,095)
Foreign currency translation adjustments 0
Balance—July 2, 2022 370,490
Summit Materials, LLC | Cement  
Goodwill [Roll Forward]  
Balance—January 1, 2022 204,656
Dispositions 0
Foreign currency translation adjustments 0
Balance—July 2, 2022 $ 204,656