Unaudited Consolidated Statements of Operations - Summit Materials LLC - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jul. 02, 2022	Jul. 01, 2023	Jul. 02, 2022
Revenue:
Total revenue	$ 729,150	$ 686,554	$ 1,164,538	$ 1,107,501
Cost of revenue (excluding items shown separately below):
Total cost of revenue	492,403	484,205	846,440	837,585
General and administrative expenses	55,550	47,651	101,912	99,575
Depreciation, depletion, amortization and accretion	54,787	47,157	105,681	98,350
Gain on sale of property, plant and equipment	(3,223)	(3,695)	(3,653)	(4,950)
Operating income	129,633	111,236	114,158	76,941
Interest expense	27,902	20,599	55,322	40,748
Loss on debt financings	0	0	493	0
Gain on sale of businesses	0	(156,053)	0	(170,258)
Other income, net	(5,478)	(977)	(11,188)	(1,673)
Income from operations before taxes	107,209	246,713	69,531	207,170
Income tax expense	22,481	53,947	16,015	49,204
Net income attributable to Summit Inc.	83,637	190,113	52,833	155,821
Summit Materials, LLC
Revenue:
Total revenue	729,150	686,554	1,164,538	1,107,501
Cost of revenue (excluding items shown separately below):
Total cost of revenue	492,403	484,205	846,440	837,585
General and administrative expenses	55,550	47,651	101,912	99,575
Depreciation, depletion, amortization and accretion	54,787	47,157	105,681	98,350
Gain on sale of property, plant and equipment	(3,223)	(3,695)	(3,653)	(4,950)
Operating income	129,633	111,236	114,158	76,941
Interest expense	27,902	20,599	55,322	40,748
Loss on debt financings	0	0	493	0
Gain on sale of businesses	0	(156,053)	0	(170,258)
Other income, net	(5,478)	(977)	(11,188)	(1,673)
Income from operations before taxes	107,209	247,667	69,531	208,124
Income tax expense	7,119	5,566	6,652	12,410
Net income attributable to Summit Inc.	100,090	242,101	62,879	195,714
Excluding delivery and subcontract revenue
Revenue:
Total revenue	680,373	631,918	1,087,643	1,024,413
Cost of revenue (excluding items shown separately below):
Total cost of revenue	443,626	429,569	769,545	754,497
Excluding delivery and subcontract revenue | Summit Materials, LLC
Revenue:
Total revenue	680,373	631,918	1,087,643	1,024,413
Cost of revenue (excluding items shown separately below):
Total cost of revenue	443,626	429,569	769,545	754,497
Product
Revenue:
Total revenue	595,714	542,939	967,886	898,608
Cost of revenue (excluding items shown separately below):
Total cost of revenue	377,634	360,356	673,515	650,701
Product | Summit Materials, LLC
Revenue:
Total revenue	595,714	542,939	967,886	898,608
Cost of revenue (excluding items shown separately below):
Total cost of revenue	377,634	360,356	673,515	650,701
Service
Revenue:
Total revenue	84,659	88,979	119,757	125,805
Cost of revenue (excluding items shown separately below):
Total cost of revenue	65,992	69,213	96,030	103,796
Service | Summit Materials, LLC
Revenue:
Total revenue	84,659	88,979	119,757	125,805
Cost of revenue (excluding items shown separately below):
Total cost of revenue	65,992	69,213	96,030	103,796
Delivery and subcontract revenue
Revenue:
Total revenue	48,777	54,636	76,895	83,088
Cost of revenue (excluding items shown separately below):
Total cost of revenue	48,777	54,636	76,895	83,088
Delivery and subcontract revenue | Summit Materials, LLC
Revenue:
Total revenue	48,777	54,636	76,895	83,088
Cost of revenue (excluding items shown separately below):
Total cost of revenue	$ 48,777	$ 54,636	$ 76,895	$ 83,088