DEBT - Schedule of Activity for Deferred Financing Fees (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2024	Apr. 01, 2023
Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Accumulated Amortization [Roll Forward]
Beginning balance	$ 14,463	$ 11,489
Loan origination fees	17,550	1,566
Amortization	(1,550)	(616)
Write off of deferred financing fees	(1,462)	(160)
Ending balance	29,001	12,279
Summit Materials, LLC
Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Accumulated Amortization [Roll Forward]
Beginning balance	14,463	11,489
Loan origination fees	17,550	1,566
Amortization	(1,550)	(616)
Write off of deferred financing fees	(1,462)	(160)
Ending balance	$ 29,001	$ 12,279