GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION - Schedule of Condensed Consolidating Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2023	Apr. 02, 2022
Condensed Consolidating Statements of Operations
Revenue	$ 435,388	$ 420,947
Cost of revenue (excluding items shown separately below)	354,037	353,380
Depreciation, depletion, amortization and accretion	50,894	51,193
Operating (loss) income	(15,475)	(34,295)
Gain / Loss on sale of business	0	(14,205)
(Loss) income from operation before taxes	(37,678)	(39,543)
Income tax benefit	(6,466)	(4,743)
Net (loss) income attributable to Summit	(30,804)	(34,292)
Comprehensive (loss) income attributable to member of Summit Materials, LLC	(30,643)	(32,986)
Summit Materials, LLC
Condensed Consolidating Statements of Operations
Revenue	435,388	420,947
Cost of revenue (excluding items shown separately below)	354,037	353,380
General and administrative expenses	45,932	50,669
Depreciation, depletion, amortization and accretion	50,894	51,193
Operating (loss) income	(15,475)	(34,295)
Other (income) loss, net	(5,217)	(696)
Interest expense (income)	27,420	20,149
Gain / Loss on sale of business	0	(14,205)
(Loss) income from operation before taxes	(37,678)	(39,543)
Income tax benefit	(467)	6,844
Net (loss) income attributable to Summit	(37,211)	(46,387)
Comprehensive (loss) income attributable to member of Summit Materials, LLC	(37,008)	(44,643)
Summit Materials, LLC | Eliminations
Condensed Consolidating Statements of Operations
Revenue	(795)	(1,330)
Cost of revenue (excluding items shown separately below)	(795)	(1,330)
General and administrative expenses	0	0
Depreciation, depletion, amortization and accretion	0	0
Operating (loss) income	0	0
Other (income) loss, net	14,715	5,782
Interest expense (income)	0	0
Gain / Loss on sale of business		0
(Loss) income from operation before taxes	(14,715)	(5,782)
Income tax benefit	0	0
Net (loss) income attributable to Summit	(14,715)	(5,782)
Comprehensive (loss) income attributable to member of Summit Materials, LLC	(14,512)	(4,038)
Issuers | Summit Materials, LLC | Reportable Legal Entities
Condensed Consolidating Statements of Operations
Revenue	0	0
Cost of revenue (excluding items shown separately below)	0	0
General and administrative expenses	15,221	17,304
Depreciation, depletion, amortization and accretion	988	750
Operating (loss) income	(16,209)	(18,054)
Other (income) loss, net	(19,147)	(5,919)
Interest expense (income)	39,845	33,902
Gain / Loss on sale of business		0
(Loss) income from operation before taxes	(36,907)	(46,037)
Income tax benefit	304	350
Net (loss) income attributable to Summit	(37,211)	(46,387)
Comprehensive (loss) income attributable to member of Summit Materials, LLC	(37,008)	(44,643)
Guarantors  | Summit Materials, LLC | Reportable Legal Entities
Condensed Consolidating Statements of Operations
Revenue	408,422	395,180
Cost of revenue (excluding items shown separately below)	335,210	334,264
General and administrative expenses	28,947	31,672
Depreciation, depletion, amortization and accretion	47,153	47,496
Operating (loss) income	(2,888)	(18,252)
Other (income) loss, net	(277)	(552)
Interest expense (income)	(13,795)	(15,123)
Gain / Loss on sale of business		(14,205)
(Loss) income from operation before taxes	11,184	11,628
Income tax benefit	(1,510)	6,318
Net (loss) income attributable to Summit	12,694	5,310
Comprehensive (loss) income attributable to member of Summit Materials, LLC	12,694	5,310
Non-Guarantors | Summit Materials, LLC | Reportable Legal Entities
Condensed Consolidating Statements of Operations
Revenue	27,761	27,097
Cost of revenue (excluding items shown separately below)	19,622	20,446
General and administrative expenses	1,764	1,693
Depreciation, depletion, amortization and accretion	2,753	2,947
Operating (loss) income	3,622	2,011
Other (income) loss, net	(508)	(7)
Interest expense (income)	1,370	1,370
Gain / Loss on sale of business		0
(Loss) income from operation before taxes	2,760	648
Income tax benefit	739	176
Net (loss) income attributable to Summit	2,021	472
Comprehensive (loss) income attributable to member of Summit Materials, LLC	$ 1,818	$ (1,272)