Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Cash flow from operating activities:
Net loss	$ (46,726)	$ (71,501)
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation, depletion, amortization and accretion	55,278	57,039
Share-based compensation expense	4,905	5,906
Net gain on asset disposals	(1,933)	(1,735)
Non-cash loss on debt financings	0	2,850
Change in deferred tax asset, net	(24,194)	(28,028)
Other	1,611	47
Decrease (increase) in operating assets, net of acquisitions and dispositions:
Accounts receivable, net	19,939	20,118
Inventories	(26,979)	(705)
Costs and estimated earnings in excess of billings	1,710	1,541
Other current assets	(2,519)	(3,447)
Other assets	5,543	2,576
(Decrease) increase in operating liabilities, net of acquisitions and dispositions:
Accounts payable	(2,712)	(5,431)
Accrued expenses	(20,776)	(6,963)
Billings in excess of costs and estimated earnings	(245)	1,195
Tax receivable agreement liability	993	59
Other liabilities	(3,316)	(1,807)
Net cash used in operating activities	(38,931)	(30,676)
Cash flow from investing activities:
Acquisitions, net of cash acquired	0	(2,842)
Purchases of property, plant and equipment	(61,829)	(62,188)
Proceeds from the sale of property, plant and equipment	3,160	2,797
Other	1,801	(178)
Net cash used for investing activities	(56,868)	(62,411)
Cash flow from financing activities:
Proceeds from debt issuances	0	300,000
Debt issuance costs	0	(5,774)
Payments on debt	(5,493)	(256,333)
Payments on acquisition-related liabilities	(9,515)	(8,933)
Proceeds from stock option exercises	310	766
Other	(908)	(501)
Net cash (used in) provided by financing activities	(15,606)	29,225
Impact of foreign currency on cash	(800)	191
Net (decrease) increase in cash	(112,205)	(63,671)
Cash and cash equivalents—beginning of period	311,319	128,508
Cash and cash equivalents—end of period	199,114	64,837
Summit Materials, LLC
Cash flow from operating activities:
Net loss	(63,625)	(91,564)
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation, depletion, amortization and accretion	55,160	56,871
Share-based compensation expense	4,905	5,906
Net gain on asset disposals	(1,933)	(1,735)
Non-cash loss on debt financings	0	2,850
Change in deferred tax asset, net	(6,184)	(7,738)
Other	1,611	47
Decrease (increase) in operating assets, net of acquisitions and dispositions:
Accounts receivable, net	19,939	20,118
Inventories	(26,979)	(705)
Costs and estimated earnings in excess of billings	1,710	1,541
Other current assets	(2,519)	(3,447)
Other assets	5,543	2,576
(Decrease) increase in operating liabilities, net of acquisitions and dispositions:
Accounts payable	(2,712)	(6,126)
Accrued expenses	(20,776)	(6,268)
Billings in excess of costs and estimated earnings	(245)	1,195
Other liabilities	(3,316)	(1,807)
Net cash used in operating activities	(38,931)	(30,676)
Cash flow from investing activities:
Acquisitions, net of cash acquired	0	(2,842)
Purchases of property, plant and equipment	(61,829)	(62,188)
Proceeds from the sale of property, plant and equipment	3,160	2,797
Other	1,801	(178)
Net cash used for investing activities	(56,868)	(62,411)
Cash flow from financing activities:
Capital contributions by member	310	766
Proceeds from debt issuances	0	300,000
Debt issuance costs	0	(5,774)
Payments on debt	(5,493)	(256,333)
Payments on acquisition-related liabilities	(7,015)	(6,433)
Distributions from partnership	(2,500)	(2,500)
Other	(908)	(501)
Net cash (used in) provided by financing activities	(15,606)	29,225
Impact of foreign currency on cash	(800)	191
Net (decrease) increase in cash	(112,205)	(63,671)
Cash and cash equivalents—beginning of period	311,319	128,508
Cash and cash equivalents—end of period	$ 199,114	$ 64,837