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ACQUISITIONS, DISPOSTIONS, GOODWILL AND INTANGIBLES - Summary of Goodwill by Reportable Segments (Details)
$ in Thousands
9 Months Ended
Oct. 02, 2021
USD ($)
Goodwill [Roll Forward]  
Balance—January 2, 2021 $ 1,201,291
Dispositions (26,742)
Foreign currency translation adjustments 306
Balance—October 2, 2021 1,174,855
West  
Goodwill [Roll Forward]  
Balance—January 2, 2021 586,209
Dispositions (16,222)
Foreign currency translation adjustments 306
Balance—October 2, 2021 570,293
East  
Goodwill [Roll Forward]  
Balance—January 2, 2021 410,426
Dispositions (10,520)
Foreign currency translation adjustments 0
Balance—October 2, 2021 399,906
Cement  
Goodwill [Roll Forward]  
Balance—January 2, 2021 204,656
Dispositions 0
Foreign currency translation adjustments 0
Balance—October 2, 2021 204,656
Summit Materials, LLC  
Goodwill [Roll Forward]  
Balance—January 2, 2021 1,202,291
Dispositions (26,742)
Foreign currency translation adjustments 306
Balance—October 2, 2021 1,175,855
Summit Materials, LLC | West  
Goodwill [Roll Forward]  
Balance—January 2, 2021 587,209
Dispositions (16,222)
Foreign currency translation adjustments 306
Balance—October 2, 2021 571,293
Summit Materials, LLC | East  
Goodwill [Roll Forward]  
Balance—January 2, 2021 410,426
Dispositions (10,520)
Foreign currency translation adjustments 0
Balance—October 2, 2021 399,906
Summit Materials, LLC | Cement  
Goodwill [Roll Forward]  
Balance—January 2, 2021 204,656
Dispositions 0
Foreign currency translation adjustments 0
Balance—October 2, 2021 $ 204,656