Unaudited Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Revenue:
Product	$ 512,822	$ 465,556	$ 1,229,596	$ 1,088,299
Service	112,195	108,831	234,572	223,500
Net revenue	625,017	574,387	1,464,168	1,311,799
Delivery and subcontract revenue	69,644	59,794	145,804	130,752
Total revenue	694,661	634,181	1,609,972	1,442,551
Cost of revenue (excluding items shown separately below):
Product	321,586	277,301	814,166	677,861
Service	80,573	72,450	170,626	154,408
Net cost of revenue	402,159	349,751	984,792	832,269
Delivery and subcontract cost	69,644	59,794	145,804	130,752
Total cost of revenue	471,803	409,545	1,130,596	963,021
General and administrative expenses	59,457	59,175	190,975	175,729
Depreciation, depletion, amortization and accretion	53,974	48,969	150,663	133,756
Transaction costs	1,260	2,581	3,817	6,474
Operating income	108,167	113,911	133,921	163,571
Interest expense	28,889	28,921	86,616	79,876
Loss on debt financings	0	0	149	190
Tax receivable agreement expense	0	501,752	0	503,277
Gain on sale of business	(12,108)	0	(12,108)	0
Other income, net	(3,371)	(2,716)	(11,942)	(3,963)
Income (loss) from operations before taxes	94,757	(414,046)	71,206	(415,809)
Income tax expense (benefit)	20,765	(498,333)	16,249	(497,076)
Net income	73,992	84,287	54,957	81,267
Net income (loss) attributable to noncontrolling interest in subsidiaries	0	59	0	(27)
Net income attributable to Summit Holdings	2,703	2,964	1,888	2,474
Net income attributable to Summit Inc.	71,289	81,264	53,069	78,820
Summit Materials, LLC
Revenue:
Product	512,822	465,556	1,229,596	1,088,299
Service	112,195	108,831	234,572	223,500
Net revenue	625,017	574,387	1,464,168	1,311,799
Delivery and subcontract revenue	69,644	59,794	145,804	130,752
Total revenue	694,661	634,181	1,609,972	1,442,551
Cost of revenue (excluding items shown separately below):
Product	321,586	277,301	814,166	677,861
Service	80,573	72,450	170,626	154,408
Net cost of revenue	402,159	349,751	984,792	832,269
Delivery and subcontract cost	69,644	59,794	145,804	130,752
Total cost of revenue	471,803	409,545	1,130,596	963,021
General and administrative expenses	59,457	59,175	190,975	175,729
Depreciation, depletion, amortization and accretion	53,974	48,969	150,663	133,756
Transaction costs	1,260	2,581	3,817	6,474
Operating income	108,167	113,911	133,921	163,571
Interest expense	28,720	28,708	86,066	79,195
Loss on debt financings	0	0	149	190
Gain on sale of business	(12,108)	0	(12,108)	0
Other income, net	(3,371)	(2,716)	(11,942)	(3,963)
Income (loss) from operations before taxes	94,926	87,919	71,756	88,149
Income tax expense (benefit)	4,499	5,286	3,323	6,543
Net income	90,427	82,633	68,433	81,606
Net income (loss) attributable to noncontrolling interest	0	59	0	(27)
Net income attributable to Summit Inc.	$ 90,427	$ 82,574	$ 68,433	$ 81,633
Common Class A
Income per share of Class A common stock:
Basic (usd per share)	$ 0.64	$ 0.74	$ 0.48	$ 0.73
Diluted (usd per share)	$ 0.64	$ 0.73	$ 0.47	$ 0.72
Weighted average shares of Class A common stock:
Basic (in shares)	111,641,344	109,545,111	111,288,211	108,219,132
Diluted (in shares)	111,940,067	110,824,468	112,472,724	108,848,680