INCOME TAXES - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jul. 02, 2022	Jul. 01, 2023	Jul. 02, 2022	Dec. 31, 2022
Income Taxes [Line Items]
Income tax expense	$ 22,481,000	$ 53,947,000	$ 16,015,000	$ 49,204,000
Valuation allowance	1,113,000		1,113,000		$ 1,113,000
Income tax provision, interest or penalties recognized	0	0	0	0
Tax receivable agreement liability	322,624,000		322,624,000		327,812,000
Tax Receivable Agreement
Income Taxes [Line Items]
Tax receivable agreement liability	327,800,000		327,800,000		$ 328,400,000
Summit Holdings LP
Income Taxes [Line Items]
Distributions to LP unitholders			$ 0
Summit Holdings LP | Tax Receivable Agreement
Income Taxes [Line Items]
Percentage of benefits to be paid on tax receivable agreement			85.00%
Summit Materials, LLC
Income Taxes [Line Items]
Income tax expense	7,119,000	5,566,000	$ 6,652,000	12,410,000
Income tax provision, interest or penalties recognized	$ 0	$ 0	$ 0	$ 0
Common Class A
Income Taxes [Line Items]
Exchanges during period (in shares)			2,000
Common Class A | Tax Receivable Agreement
Income Taxes [Line Items]
Exchanges during period (in shares)			2,000