Unaudited Consolidated Statements of Operations - Summit Materials Inc - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2023	Apr. 02, 2022
Revenue:
Revenue	$ 435,388	$ 420,947
Cost of revenue (excluding items shown separately below):
Total cost of revenue	354,037	353,380
General and administrative expenses	46,362	51,924
Depreciation, depletion, amortization and accretion	50,894	51,193
Gain on sale of property, plant and equipment	(430)	(1,255)
Operating (loss) income	(15,475)	(34,295)
Interest expense	27,420	20,149
Loss on debt financings	493	0
Gain on sale of businesses	0	(14,205)
Other income, net	(5,710)	(696)
(Loss) income from operation before taxes	(37,678)	(39,543)
Income tax benefit	(6,466)	(4,743)
Net loss	(31,212)	(34,800)
Net loss attributable to Summit Holdings	(408)	(508)
Net (loss) income attributable to Summit	$ (30,804)	$ (34,292)
Common Class A
Loss per share of Class A common stock:
Basic (in usd per share)	$ (0.26)	$ (0.28)
Diluted (in usd per share)	$ (0.26)	$ (0.28)
Weighted average shares of Class A common stock:
Basic (in shares)	118,564,556	120,756,555
Diluted (in shares)	118,679,656	120,916,680
Common Class A And Restricted Stock
Loss per share of Class A common stock:
Basic (in usd per share)	$ (0.26)	$ (0.28)
Weighted average shares of Class A common stock:
Basic (in shares)	118,679,656	120,916,680
Excluding delivery and subcontract revenue
Revenue:
Revenue	$ 407,270	$ 392,495
Cost of revenue (excluding items shown separately below):
Total cost of revenue	325,919	324,928
Product
Revenue:
Revenue	372,172	355,669
Cost of revenue (excluding items shown separately below):
Total cost of revenue	295,881	290,345
Service
Revenue:
Revenue	35,098	36,826
Cost of revenue (excluding items shown separately below):
Total cost of revenue	30,038	34,583
Delivery and subcontract revenue
Revenue:
Revenue	28,118	28,452
Cost of revenue (excluding items shown separately below):
Total cost of revenue	$ 28,118	$ 28,452