Unaudited Consolidated Statements of Operations - Summit Materials Inc - 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
Tax receivable agreement expense	0	954	0	954
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	84,728	192,766	53,516	157,966
Net income attributable to noncontrolling interest in Summit Holdings	1,091	2,653	683	2,145
Net income attributable to Summit Inc.	$ 83,637	$ 190,113	$ 52,833	$ 155,821
Common Class A
Earnings per share of Class A common stock:
Basic (in usd per share)	$ 0.70	$ 1.58	$ 0.44	$ 1.29
Diluted (in usd per share)	$ 0.70	$ 1.58	$ 0.44	$ 1.28
Weighted average shares of Class A common stock:
Basic (in shares)	118,848,214	120,078,273	118,706,385	120,417,414
Diluted (in shares)	119,393,709	120,660,721	119,431,604	121,374,168
Common Class A And Restricted Stock
Earnings per share of Class A common stock:
Basic (in usd per share)	$ 0.70	$ 1.58	$ 0.44	$ 1.29
Weighted average shares of Class A common stock:
Basic (in shares)	118,931,914	120,222,094	118,805,785	120,569,387
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
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
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
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