ACQUISITIONS, DISPOSTIONS, GOODWILL AND INTANGIBLES - Summary of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Oct. 01, 2022	Jan. 01, 2022
Business Acquisition [Line Items]
Goodwill	$ 1,131,764	$ 1,163,750
Summit Materials, LLC
Business Acquisition [Line Items]
Goodwill	1,132,764	1,164,750
Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Financial assets	0	0
Inventories	16	2,406
Property, plant and equipment	1,877	19,668
Intangible assets	0	702
Other assets	83	98
Financial liabilities	0	(1,742)
Other long-term liabilities	(43)	(470)
Net assets acquired	1,933	20,662
Goodwill	0	0
Purchase price	1,933	20,662
Acquisition-related liabilities	0	(1,149)
Other	0	0
Net cash paid for acquisitions	1,933	19,513
Series of Individually Immaterial Business Acquisitions | Summit Materials, LLC
Business Acquisition [Line Items]
Financial assets	0	0
Inventories	16	2,406
Property, plant and equipment	1,877	19,668
Intangible assets	0	702
Other assets	83	98
Financial liabilities	0	(1,742)
Other long-term liabilities	(43)	(470)
Net assets acquired	1,933	20,662
Goodwill	0	0
Purchase price	1,933	20,662
Acquisition-related liabilities	0	(1,149)
Other	0	0
Net cash paid for acquisitions	$ 1,933	$ 19,513