Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Revenue:
Product	$ 465,556	$ 386,236	$ 1,088,299	$ 907,679
Service	108,831	93,974	223,500	193,206
Net revenue	574,387	480,210	1,311,799	1,100,885
Delivery and subcontract revenue	59,794	49,227	130,752	102,205
Total revenue	634,181	529,437	1,442,551	1,203,090
Cost of revenue (excluding items shown separately below):
Product	277,301	224,868	677,861	559,293
Service	72,450	61,725	154,408	136,250
Net cost of revenue	349,751	286,593	832,269	695,543
Delivery and subcontract cost	59,794	49,227	130,752	102,205
Total cost of revenue	409,545	335,820	963,021	797,748
General and administrative expenses	59,175	64,096	175,729	184,956
Depreciation, depletion, amortization and accretion	48,969	39,427	133,756	109,195
Transaction costs	2,581	1,684	6,474	5,290
Operating income	113,911	88,410	163,571	105,901
Interest expense	28,921	25,273	79,876	72,467
Loss on debt financings			190
Tax receivable agreement expense	489,215		490,740
Other (income) expense, net	(2,716)	722	(3,963)	1,270
(Loss) income from operations before taxes	(401,509)	62,415	(403,272)	32,164
Income tax (benefit) expense	(483,584)	1,309	(482,327)	(7,913)
Net income	82,075	61,106	79,055	40,077
Net income (loss) attributable to noncontrolling interest in subsidiaries	59	92	(27)	57
Net income attributable to Summit Holdings	2,964	16,194	2,474	2,947
Net income attributable to Summit Materials, Inc. / member of Summit Materials, LLC	79,052	44,820	76,608	37,073
Summit Materials, LLC
Revenue:
Product	465,556	386,236	1,088,299	907,679
Service	108,831	93,974	223,500	193,206
Net revenue	574,387	480,210	1,311,799	1,100,885
Delivery and subcontract revenue	59,794	49,227	130,752	102,205
Total revenue	634,181	529,437	1,442,551	1,203,090
Cost of revenue (excluding items shown separately below):
Product	277,301	224,868	677,861	559,293
Service	72,450	61,725	154,408	136,250
Net cost of revenue	349,751	286,593	832,269	695,543
Delivery and subcontract cost	59,794	49,227	130,752	102,205
Total cost of revenue	409,545	335,820	963,021	797,748
General and administrative expenses	59,175	64,096	175,729	184,956
Depreciation, depletion, amortization and accretion	48,969	39,427	133,756	109,195
Transaction costs	2,581	1,684	6,474	5,290
Operating income	113,911	88,410	163,571	105,901
Interest expense	28,708	25,019	79,195	71,668
Loss on debt financings			190
Other (income) expense, net	(2,716)	722	(3,963)	1,253
(Loss) income from operations before taxes	87,919	62,669	88,149	32,980
Income tax (benefit) expense	5,286	1,309	6,543	(7,896)
Net income	82,633	61,360	81,606	40,876
Net income (loss) attributable to noncontrolling interest	59	92	(27)	57
Net income attributable to Summit Materials, Inc. / member of Summit Materials, LLC	$ 82,574	$ 61,268	$ 81,633	$ 40,819
Common Class A
Income per share of Class A common stock:
Basic	$ 0.73	$ 0.60	$ 0.72	$ 0.59
Diluted	$ 0.72	$ 0.60	$ 0.71	$ 0.40
Weighted average shares of Class A common stock:
Basic	108,024,055	74,433,487	106,698,076	62,686,433
Diluted	109,303,412	74,579,797	107,327,624	101,479,150