ACQUISITIONS, DISPOSTIONS, GOODWILL AND INTANGIBLES - Summary of Goodwill by Reportable Segments (Details) $ in Thousands	9 Months Ended
	Oct. 01, 2022 USD ($)
Goodwill [Roll Forward]
Balance—January 1, 2022	$ 1,163,750
Dispositions	(27,084)
Foreign currency translation adjustments	(4,902)
Balance—October 1, 2022	1,131,764
West
Goodwill [Roll Forward]
Balance—January 1, 2022	570,509
Dispositions	0
Foreign currency translation adjustments	(4,902)
Balance—October 1, 2022	565,607
East
Goodwill [Roll Forward]
Balance—January 1, 2022	388,585
Dispositions	(27,084)
Foreign currency translation adjustments	0
Balance—October 1, 2022	361,501
Cement
Goodwill [Roll Forward]
Balance—January 1, 2022	204,656
Dispositions	0
Foreign currency translation adjustments	0
Balance—October 1, 2022	204,656
Summit Materials, LLC
Goodwill [Roll Forward]
Balance—January 1, 2022	1,164,750
Dispositions	(27,084)
Foreign currency translation adjustments	(4,902)
Balance—October 1, 2022	1,132,764
Summit Materials, LLC | West
Goodwill [Roll Forward]
Balance—January 1, 2022	571,509
Dispositions	0
Foreign currency translation adjustments	(4,902)
Balance—October 1, 2022	566,607
Summit Materials, LLC | East
Goodwill [Roll Forward]
Balance—January 1, 2022	388,585
Dispositions	(27,084)
Foreign currency translation adjustments	0
Balance—October 1, 2022	361,501
Summit Materials, LLC | Cement
Goodwill [Roll Forward]
Balance—January 1, 2022	204,656
Dispositions	0
Foreign currency translation adjustments	0
Balance—October 1, 2022	$ 204,656