Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Revenue:
Product	$ 1,449,936	$ 1,223,008	$ 1,043,843
Service	302,473	265,266	246,123
Net revenue	1,752,409	1,488,274	1,289,966
Delivery and subcontract revenue	180,166	137,789	142,331
Total revenue	1,932,575	1,626,063	1,432,297
Cost of revenue (excluding items shown separately below):
Product	898,281	751,419	676,074
Service	203,330	182,584	171,857
Net cost of revenue	1,101,611	934,003	847,931
Delivery and subcontract cost	180,166	137,789	142,331
Total cost of revenue	1,281,777	1,071,792	990,262
General and administrative expenses	242,670	243,512	177,769
Depreciation, depletion, amortization and accretion	179,518	149,300	119,723
Transaction costs	7,733	6,797	9,519
Operating income	220,877	154,662	135,024
Interest expense	108,549	97,536	84,629
Loss on debt financings	4,815		71,631
Tax receivable agreement expense	271,016	14,938
Other expense (income), net	5,303	(1,361)	2,042
(Loss) income from operations before taxes	(158,200)	40,827	(19,194)
Income tax benefit	(283,977)	(5,299)	(18,263)
Income (loss) from continuing operations	125,777	46,126	(931)
Income from discontinued operations			(2,415)
Net income	125,777	46,126	1,484
Net income (loss) attributable to noncontrolling interest in subsidiaries	(27)	16	(1,826)
Net income (loss) attributable to Summit Holdings	3,974	9,327	(24,408)
Net income attributable to Summit Materials, Inc. / member of Summit Materials, LLC	121,830	36,783	27,718
Summit Materials, LLC
Revenue:
Product	1,449,936	1,223,008	1,043,843
Service	302,473	265,266	246,123
Net revenue	1,752,409	1,488,274	1,289,966
Delivery and subcontract revenue	180,166	137,789	142,331
Total revenue	1,932,575	1,626,063	1,432,297
Cost of revenue (excluding items shown separately below):
Product	898,281	751,419	676,074
Service	203,330	182,584	171,857
Net cost of revenue	1,101,611	934,003	847,931
Delivery and subcontract cost	180,166	137,789	142,331
Total cost of revenue	1,281,777	1,071,792	990,262
General and administrative expenses	242,670	243,512	177,769
Depreciation, depletion, amortization and accretion	179,518	149,300	119,723
Transaction costs	7,733	6,797	9,519
Operating income	220,877	154,662	135,024
Interest expense	107,655	96,483	83,757
Loss on debt financings	4,815		71,631
Other expense (income), net	5,289	(1,374)	2,042
(Loss) income from operations before taxes	113,696	56,805	(18,322)
Income tax benefit	(20,345)	(5,282)	(18,263)
Income (loss) from continuing operations	134,041	62,087	(59)
Income from discontinued operations			(2,415)
Net income	134,041	62,087	2,356
Net income (loss) attributable to noncontrolling interest	(27)	16	(1,826)
Net income attributable to Summit Materials, Inc. / member of Summit Materials, LLC	$ 134,068	$ 62,071	$ 4,182
Common Class A
Income per share of Class A common stock:
Basic	$ 1.12	$ 0.52	$ 0.68
Diluted	$ 1.11	$ 0.52	$ 0.50
Weighted average shares of Class A common stock:
Basic	108,696,438	70,355,042	40,888,437
Diluted	109,490,898	70,838,508	90,993,322