Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Dec. 27, 2014
Revenue:
Product	$ 1,223,008	$ 1,043,843	$ 806,280
Service	265,266	246,123	264,325
Net revenue	1,488,274	1,289,966	1,070,605
Delivery and subcontract revenue	137,789	142,331	133,626
Total revenue	1,626,063	1,432,297	1,204,231
Cost of revenue (excluding items shown separately below):
Product	751,697	676,457	566,986
Service	182,584	171,857	186,548
Net cost of revenue	934,281	848,314	753,534
Delivery and subcontract cost	137,789	142,331	133,626
Total cost of revenue	1,072,070	990,645	887,160
General and administrative expenses	243,862	177,769	150,732
Depreciation, depletion, amortization and accretion	149,300	119,723	87,826
Transaction costs	6,797	9,519	8,554
Operating income (loss)	154,034	134,641	69,959
Interest expense	97,536	84,629	86,742
Loss on debt financings		71,631
Tax receivable agreement expense	14,938
Other expense (income), net	733	(2,425)	(3,447)
Income (loss) from operations before taxes	40,827	(19,194)	(13,336)
Income tax benefit	(5,299)	(18,263)	(6,983)
Income (loss) from continuing operations	46,126	(931)	(6,353)
Income from discontinued operations		(2,415)	(71)
Net income (loss)	46,126	1,484	(6,282)
Net income (loss) attributable to noncontrolling interest in subsidiaries	16	(1,826)	2,495
Net income (loss) attributable to Summit Holdings	9,327	(24,408)	(8,777)
Net income (loss) attributable to Summit Materials, Inc. / member of Summit Materials, LLC	36,783	27,718
Summit Materials, LLC
Revenue:
Product	1,223,008	1,043,843	806,280
Service	265,266	246,123	264,325
Net revenue	1,488,274	1,289,966	1,070,605
Delivery and subcontract revenue	137,789	142,331	133,626
Total revenue	1,626,063	1,432,297	1,204,231
Cost of revenue (excluding items shown separately below):
Product	751,697	676,457	566,986
Service	182,584	171,857	186,548
Net cost of revenue	934,281	848,314	753,534
Delivery and subcontract cost	137,789	142,331	133,626
Total cost of revenue	1,072,070	990,645	887,160
General and administrative expenses	243,862	177,769	150,732
Depreciation, depletion, amortization and accretion	149,300	119,723	87,826
Transaction costs	6,797	9,519	8,554
Operating income (loss)	154,034	134,641	69,959
Interest expense	96,483	83,757	86,742
Loss on debt financings		71,631
Other expense (income), net	746	(2,425)	(3,447)
Income (loss) from operations before taxes	56,805	(18,322)	(13,336)
Income tax benefit	(5,282)	(18,263)	(6,983)
Income (loss) from continuing operations	62,087	(59)	(6,353)
Income from discontinued operations		(2,415)	(71)
Net income (loss)	62,087	2,356	(6,282)
Net income (loss) attributable to noncontrolling interest	16	(1,826)	2,495
Net income (loss) attributable to Summit Materials, Inc. / member of Summit Materials, LLC	$ 62,071	$ 4,182	$ (8,777)
Common Class A
Earnings per share of Class A common stock:
Basic	$ 0.53	$ 0.70
Diluted	$ 0.53	$ 0.51
Weighted average shares of Class A common stock:
Basic	68,833,986	39,367,381
Diluted	69,317,452	89,472,266