Unaudited Consolidated Statements of Operations - Summit Materials LLC - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2024	Apr. 01, 2023
Revenue:
Total revenue	$ 805,015	$ 435,388
Cost of revenue (excluding items shown separately below):
Total cost of revenue	624,011	354,037
General and administrative expenses	68,526	45,998
Depreciation, depletion, amortization and accretion	95,971	50,894
Transaction and integration costs	62,208	364
Gain on sale of property, plant and equipment	(848)	(430)
Operating loss	(44,853)	(15,475)
Interest expense	51,892	27,420
Loss on debt financings	5,453	493
Gain on sale of businesses	(14,985)	0
Other loss, net	(8,878)	(5,710)
Loss from operations before taxes	(78,335)	(37,678)
Income tax benefit	(11,065)	(6,466)
Net loss attributable to Summit Inc.	(66,866)	(30,804)
Summit Materials, LLC
Revenue:
Total revenue	805,015	435,388
Cost of revenue (excluding items shown separately below):
Total cost of revenue	624,011	354,037
General and administrative expenses	68,526	45,998
Depreciation, depletion, amortization and accretion	95,971	50,894
Transaction and integration costs	62,208	364
Gain on sale of property, plant and equipment	(848)	(430)
Operating loss	(44,853)	(15,475)
Interest expense	51,892	27,420
Loss on debt financings	5,453	493
Gain on sale of businesses	(14,985)	0
Other loss, net	(8,687)	(5,710)
Loss from operations before taxes	(78,526)	(37,678)
Income tax benefit	(196)	(467)
Net loss attributable to Summit Inc.	(78,330)	(37,211)
Excluding delivery and subcontract revenue
Revenue:
Total revenue	773,229	407,270
Cost of revenue (excluding items shown separately below):
Total cost of revenue	592,225	325,919
Excluding delivery and subcontract revenue | Summit Materials, LLC
Revenue:
Total revenue	773,229	407,270
Cost of revenue (excluding items shown separately below):
Total cost of revenue	592,225	325,919
Product
Revenue:
Total revenue	728,694	372,172
Cost of revenue (excluding items shown separately below):
Total cost of revenue	556,020	295,881
Product | Summit Materials, LLC
Revenue:
Total revenue	728,694	372,172
Cost of revenue (excluding items shown separately below):
Total cost of revenue	556,020	295,881
Service
Revenue:
Total revenue	44,535	35,098
Cost of revenue (excluding items shown separately below):
Total cost of revenue	36,205	30,038
Service | Summit Materials, LLC
Revenue:
Total revenue	44,535	35,098
Cost of revenue (excluding items shown separately below):
Total cost of revenue	36,205	30,038
Delivery and subcontract revenue
Revenue:
Total revenue	31,786	28,118
Cost of revenue (excluding items shown separately below):
Total cost of revenue	31,786	28,118
Delivery and subcontract revenue | Summit Materials, LLC
Revenue:
Total revenue	31,786	28,118
Cost of revenue (excluding items shown separately below):
Total cost of revenue	$ 31,786	$ 28,118