INCOME TAXES - Narrative (Details) - USD ($)	3 Months Ended
	Apr. 02, 2022	Apr. 03, 2021	Jan. 01, 2022
Income Taxes [Line Items]
Income tax benefit	$ (4,743,000)	$ (5,443,000)
Valuation allowance	1,675,000		$ 1,675,000
Income tax provision, interest or penalties recognized	0	0
Tax receivable agreement liability	326,548,000		326,548,000
Tax Receivable Agreement
Income Taxes [Line Items]
Tax receivable agreement liability	326,500,000		$ 326,500,000
Summit Holdings LP
Income Taxes [Line Items]
Distributions to LP Unitholders	$ 0	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 benefit	$ 6,844,000	(836,000)
Income tax provision, interest or penalties recognized	$ 0	$ 0
Common Class A
Income Taxes [Line Items]
Exchanges during period (in shares)		711,794
Common Class A | Tax Receivable Agreement
Income Taxes [Line Items]
Exchanges during period (in shares)	0