Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018
Cash flow from operating activities:
Net income	$ 24,726	$ 54,957
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, amortization and accretion	166,997	152,829
Share-based compensation expense	15,424	19,833
Net gain on asset disposals	(8,030)	(27,261)
Non-cash loss on debt financings	2,850	0
Change in deferred tax asset, net	32,736	12,577
Other	(1,609)	873
(Increase) decrease in operating assets, net of acquisitions and dispositions:
Accounts receivable, net	(121,196)	(90,481)
Inventories	16,296	(26,027)
Costs and estimated earnings in excess of billings	(31,085)	(37,643)
Other current assets	5,635	(6,819)
Other assets	4,992	(1,217)
(Decrease) increase in operating liabilities, net of acquisitions and dispositions:
Accounts payable	52,423	24,978
Accrued expenses	8,447	(2,197)
Billings in excess of costs and estimated earnings	(618)	3,850
Tax receivable agreement liability	424	1,812
Other liabilities	(5,805)	(1,807)
Net cash provided by operating activities	163,843	70,557
Cash flow from investing activities:
Acquisitions, net of cash acquired	(2,842)	(210,894)
Purchases of property, plant and equipment	(139,762)	(183,752)
Proceeds from the sale of property, plant and equipment	13,035	18,426
Proceeds from sale of business	0	21,564
Other	(207)	2,660
Net cash used for investing activities	(129,776)	(351,996)
Cash flow from financing activities:
Proceeds from debt issuances	300,000	64,500
Debt issuance costs	(6,312)	(550)
Payments on debt	(264,906)	(79,027)
Payments on acquisition-related liabilities	(11,000)	(35,321)
Distributions from partnership	0	(69)
Proceeds from stock option exercises	2,559	15,615
Other	(501)	(1,913)
Net cash provided by (used in) financing activities	19,840	(36,765)
Impact of foreign currency on cash	174	(422)
Net increase (decrease) in cash	54,081	(318,626)
Cash and cash equivalents—beginning of period	128,508	383,556
Cash and cash equivalents—end of period	182,589	64,930
Summit Materials, LLC
Cash flow from operating activities:
Net income	47,136	68,433
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, amortization and accretion	166,594	152,279
Share-based compensation expense	15,424	19,833
Net gain on asset disposals	(8,030)	(27,261)
Non-cash loss on debt financings	2,850	0
Change in deferred tax asset, net	11,153	1,463
Other	(1,609)	873
(Increase) decrease in operating assets, net of acquisitions and dispositions:
Accounts receivable, net	(121,196)	(90,481)
Inventories	16,296	(26,027)
Costs and estimated earnings in excess of billings	(31,085)	(37,643)
Other current assets	5,635	(6,819)
Other assets	4,992	(1,217)
(Decrease) increase in operating liabilities, net of acquisitions and dispositions:
Accounts payable	51,728	24,392
Accrued expenses	9,142	(1,611)
Billings in excess of costs and estimated earnings	(618)	3,850
Other liabilities	(5,805)	(1,807)
Net cash provided by operating activities	163,843	70,557
Cash flow from investing activities:
Acquisitions, net of cash acquired	(2,842)	(210,894)
Purchases of property, plant and equipment	(139,762)	(183,752)
Proceeds from the sale of property, plant and equipment	13,035	18,426
Proceeds from sale of business	0	21,564
Other	(207)	2,660
Net cash used for investing activities	(129,776)	(351,996)
Cash flow from financing activities:
Capital contributions by member	2,559	15,615
Proceeds from debt issuances	300,000	64,500
Debt issuance costs	(6,312)	(550)
Payments on debt	(264,906)	(79,027)
Payments on acquisition-related liabilities	(8,500)	(32,821)
Distributions from partnership	(2,500)	(2,569)
Other	(501)	(1,913)
Net cash provided by (used in) financing activities	19,840	(36,765)
Impact of foreign currency on cash	174	(422)
Net increase (decrease) in cash	54,081	(318,626)
Cash and cash equivalents—beginning of period	128,508	383,556
Cash and cash equivalents—end of period	$ 182,589	$ 64,930