Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Cash flow from operating activities:
Net income	$ 61,123	$ 36,330	$ 125,777
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, amortization and accretion	222,862	208,772	193,107
Share-based compensation expense	20,403	25,378	21,140
Net gain on asset disposals	(10,294)	(30,093)	(7,638)
Non-cash loss on debt financings	2,850	0	3,856
Change in deferred tax asset, net	16,012	57,490	(289,219)
Other	(2,135)	2,018	(2,359)
(Increase) decrease in operating assets, net of acquisitions and dispositions:
Accounts receivable, net	(37,049)	(5,796)	(3,720)
Inventories	8,582	(11,598)	(18,609)
Costs and estimated earnings in excess of billings	5,558	(8,702)	(1,825)
Other current assets	5,465	(7,159)	8,703
Other assets	5,085	(106)	(3,103)
(Decrease) increase in operating liabilities, net of acquisitions and dispositions:
Accounts payable	18,903	(13,403)	6,192
Accrued expenses	7,640	(16,544)	(7,006)
Billings in excess of costs and estimated earnings	1,988	(5,052)	109
Tax receivable agreement liability	17,291	(21,666)	273,194
Other liabilities	(7,100)	(501)	(6,416)
Net cash provided by operating activities	337,184	209,368	292,183
Cash flow from investing activities:
Acquisitions, net of cash acquired	(5,392)	(246,017)	(374,930)
Purchases of property, plant and equipment	(177,495)	(220,685)	(194,146)
Proceeds from the sale of property, plant and equipment	21,173	21,635	17,072
Proceeds from sale of business	0	21,564	0
Other	(1,095)	3,804	(471)
Net cash used for investing activities	(162,809)	(419,699)	(552,475)
Cash flow from financing activities:
Proceeds from equity offerings	0	0	237,600
Capital issuance costs	0	0	(627)
Proceeds from debt issuances	300,000	64,500	302,000
Debt issuance costs	(6,312)	(550)	(6,416)
Payments on debt	(270,229)	(85,042)	(16,438)
Purchase of noncontrolling interests	0	0	(532)
Payments on acquisition-related liabilities	(33,883)	(36,504)	(34,650)
Distributions from partnership	0	(69)	(1,974)
Proceeds from stock option exercises	19,076	15,615	21,661
Other	(502)	(1,943)	(869)
Net cash provided by (used in) financing activities	8,150	(43,993)	499,755
Impact of foreign currency on cash	286	(724)	701
Net increase (decrease) in cash	182,811	(255,048)	240,164
Cash and cash equivalents—beginning of period	128,508	383,556	143,392
Cash and cash equivalents—end of period	311,319	128,508	383,556
Summit Materials, LLC
Cash flow from operating activities:
Net income	88,597	63,837	134,041
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, amortization and accretion	222,341	208,055	192,213
Share-based compensation expense	20,403	25,378	21,140
Net gain on asset disposals	(10,294)	(30,093)	(7,638)
Non-cash loss on debt financings	2,850	0	3,856
Change in deferred tax asset, net	6,350	9,729	(23,070)
Other	(2,135)	2,018	(2,359)
(Increase) decrease in operating assets, net of acquisitions and dispositions:
Accounts receivable, net	(37,049)	(5,796)	(3,720)
Inventories	8,582	(11,598)	(18,609)
Costs and estimated earnings in excess of billings	5,558	(8,702)	(1,825)
Other current assets	5,465	(7,159)	8,703
Other assets	5,085	(106)	(3,103)
(Decrease) increase in operating liabilities, net of acquisitions and dispositions:
Accounts payable	18,208	(13,989)	8,040
Accrued expenses	8,335	(16,653)	(6,230)
Billings in excess of costs and estimated earnings	1,988	(5,052)	109
Other liabilities	(7,100)	(501)	(6,416)
Net cash provided by operating activities	337,184	209,368	295,132
Cash flow from investing activities:
Acquisitions, net of cash acquired	(5,392)	(246,017)	(374,930)
Purchases of property, plant and equipment	(177,495)	(220,685)	(194,146)
Proceeds from the sale of property, plant and equipment	21,173	21,635	17,072
Proceeds from sale of business	0	21,564	0
Other	(1,095)	3,804	(471)
Net cash used for investing activities	(162,809)	(419,699)	(552,475)
Cash flow from financing activities:
Capital contributions by member	19,076	15,615	304,541
Capital issuance costs	0	0	(627)
Proceeds from debt issuances	300,000	64,500	302,000
Debt issuance costs	(6,312)	(550)	(6,416)
Payments on debt	(270,229)	(85,042)	(16,438)
Purchase of noncontrolling interests	0	0	(532)
Payments on acquisition-related liabilities	(31,383)	(34,004)	(32,150)
Distributions from partnership	(2,500)	(2,569)	(51,986)
Other	(502)	(1,943)	(866)
Net cash provided by (used in) financing activities	8,150	(43,993)	497,526
Impact of foreign currency on cash	286	(724)	701
Net increase (decrease) in cash	182,811	(255,048)	240,884
Cash and cash equivalents—beginning of period	128,508	383,556	142,672
Cash and cash equivalents—end of period	$ 311,319	$ 128,508	$ 383,556