Unaudited Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2022	Oct. 02, 2021	Oct. 01, 2022	Oct. 02, 2021
Revenue:
Revenue	$ 752,747	$ 717,240	$ 1,860,248	$ 1,813,001
Cost of revenue (excluding items shown separately below):
Net cost of revenue	534,936	486,936	1,372,521	1,301,346
General and administrative expenses	39,959	47,364	139,534	146,454
Depreciation, depletion, amortization and accretion	52,133	59,082	150,483	173,651
Gain on sale of property, plant and equipment	(1,343)	(1,159)	(6,293)	(4,331)
Operating income	127,062	125,017	204,003	195,881
Interest expense	21,980	24,134	62,728	72,536
Loss on debt financings	0	6,016	0	6,016
Tax receivable agreement expense	0	0	954	0
(Gain) loss on sale of businesses	(4,115)	113	(174,373)	(15,319)
Other income, net	(3,283)	(1,137)	(4,956)	(10,721)
Income from operations before taxes	112,480	95,891	319,650	143,369
Income tax expense	24,829	20,513	74,033	33,478
Net income	87,651	75,378	245,617	109,891
Net income attributable to Summit Holdings	1,162	1,174	3,307	1,545
Net income (loss) attributable to Summit Inc/LLC	86,489	74,204	242,310	108,346
Summit Materials, LLC
Revenue:
Revenue	752,747	717,240	1,860,248	1,813,001
Cost of revenue (excluding items shown separately below):
Net cost of revenue	534,936	486,936	1,372,521	1,301,346
General and administrative expenses	39,959	47,364	139,534	146,454
Depreciation, depletion, amortization and accretion	52,133	59,082	150,483	173,651
Gain on sale of property, plant and equipment	(1,343)	(1,159)	(6,293)	(4,331)
Operating income	127,062	125,017	204,003	195,881
Interest expense	21,980	24,134	62,728	72,474
Loss on debt financings	0	6,016	0	6,016
(Gain) loss on sale of businesses	(4,115)	113	(174,373)	(15,319)
Other income, net	(3,283)	(1,137)	(4,956)	(10,721)
Income from operations before taxes	112,480	95,891	320,604	143,431
Income tax expense	7,147	7,016	19,557	12,531
Net income	105,333	88,875	301,047	130,900
Net income (loss) attributable to Summit Inc/LLC	$ 105,333	$ 88,875	$ 301,047	$ 130,900
Common Class A
Earnings per share of Class A common stock:
Basic (usd per share)	$ 0.73	$ 0.63	$ 2.05	$ 0.92
Diluted (usd per share)	$ 0.73	$ 0.62	$ 2.03	$ 0.92
Weighted average shares of Class A common stock:
Basic (in shares)	117,774,592	118,272,955	118,216,997	117,040,207
Diluted (in shares)	118,404,098	119,291,646	119,098,936	118,360,615
Common Class A And Restricted Stock
Earnings per share of Class A common stock:
Basic (usd per share)	$ 0.73	$ 0.63	$ 2.05	$ 0.92
Weighted average shares of Class A common stock:
Basic (in shares)	117,917,058	118,473,530	118,365,801	117,258,431
Excluding delivery and subcontract revenue
Revenue:
Revenue	$ 686,009	$ 662,259	$ 1,710,422	$ 1,679,270
Cost of revenue (excluding items shown separately below):
Net cost of revenue	468,198	431,955	1,222,695	1,167,615
Excluding delivery and subcontract revenue | Summit Materials, LLC
Revenue:
Revenue	686,009	662,259	1,710,422	1,679,270
Cost of revenue (excluding items shown separately below):
Net cost of revenue	468,198	431,955	1,222,695	1,167,615
Product
Revenue:
Revenue	587,138	561,938	1,485,746	1,443,972
Cost of revenue (excluding items shown separately below):
Net cost of revenue	392,187	356,214	1,042,888	980,045
Product | Summit Materials, LLC
Revenue:
Revenue	587,138	561,938	1,485,746	1,443,972
Cost of revenue (excluding items shown separately below):
Net cost of revenue	392,187	356,214	1,042,888	980,045
Service
Revenue:
Revenue	98,871	100,321	224,676	235,298
Cost of revenue (excluding items shown separately below):
Net cost of revenue	76,011	75,741	179,807	187,570
Service | Summit Materials, LLC
Revenue:
Revenue	98,871	100,321	224,676	235,298
Cost of revenue (excluding items shown separately below):
Net cost of revenue	76,011	75,741	179,807	187,570
Delivery and subcontract revenue
Revenue:
Revenue	66,738	54,981	149,826	133,731
Cost of revenue (excluding items shown separately below):
Net cost of revenue	66,738	54,981	149,826	133,731
Delivery and subcontract revenue | Summit Materials, LLC
Revenue:
Revenue	66,738	54,981	149,826	133,731
Cost of revenue (excluding items shown separately below):
Net cost of revenue	$ 66,738	$ 54,981	$ 149,826	$ 133,731