Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2022	Apr. 03, 2021
Cash flows from operating activities:
Net loss	$ (34,800)	$ (23,245)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, amortization and accretion	54,838	59,107
Share-based compensation expense	5,422	5,363
Net gain on asset and business disposals	(15,660)	(15,964)
Change in deferred tax asset, net	(7,770)	(10,145)
Other	(221)	483
Decrease (increase) in operating assets, net of acquisitions and dispositions:
Accounts receivable, net	35,836	4,946
Inventories	(36,752)	(15,412)
Costs and estimated earnings in excess of billings	(6,449)	(8,442)
Other current assets	(1,891)	(9,209)
Other assets	1,183	2,504
(Decrease) increase in operating liabilities, net of acquisitions and dispositions:
Accounts payable	16,744	14,518
Accrued expenses	(25,946)	(24,130)
Billings in excess of costs and estimated earnings	317	(2,578)
Tax receivable agreement liability	0	4,152
Other liabilities	(1,564)	(3,266)
Net cash used in operating activities	(16,713)	(21,318)
Cash flows from investing activities:
Purchases of property, plant and equipment	(57,774)	(69,757)
Proceeds from the sale of property, plant and equipment	1,439	2,663
Proceeds from sale of businesses	47,821	33,077
Other	(857)	(483)
Net cash used in investing activities	(9,371)	(34,500)
Cash flows from financing activities:
Payments on debt	(7,603)	(10,170)
Payments on acquisition-related liabilities	(11,397)	(8,096)
Repurchases of common stock	(47,509)	0
Proceeds from stock option exercises	27	15,920
Other	(1,180)	(416)
Net cash used in financing activities	(67,662)	(2,762)
Impact of foreign currency on cash	177	140
Net decrease in cash	(93,569)	(58,440)
Cash and cash equivalents—beginning of period	380,961	418,181
Cash and cash equivalents—end of period	287,392	359,741
Summit Materials, LLC
Cash flows from operating activities:
Net loss	(46,387)	(27,790)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, amortization and accretion	54,838	59,045
Share-based compensation expense	5,422	5,363
Net gain on asset and business disposals	(15,660)	(15,964)
Change in deferred tax asset, net	3,818	(1,386)
Other	(221)	483
Decrease (increase) in operating assets, net of acquisitions and dispositions:
Accounts receivable, net	35,836	4,946
Inventories	(36,752)	(15,412)
Costs and estimated earnings in excess of billings	(6,449)	(8,442)
Other current assets	(1,891)	(9,209)
Other assets	1,183	2,504
(Decrease) increase in operating liabilities, net of acquisitions and dispositions:
Accounts payable	16,744	14,518
Accrued expenses	(25,947)	(24,130)
Billings in excess of costs and estimated earnings	317	(2,578)
Other liabilities	(1,564)	(3,266)
Net cash used in operating activities	(16,713)	(21,318)
Cash flows from investing activities:
Purchases of property, plant and equipment	(57,774)	(69,757)
Proceeds from the sale of property, plant and equipment	1,439	2,663
Proceeds from sale of businesses	47,821	33,077
Other	(857)	(483)
Net cash used in investing activities	(9,371)	(34,500)
Cash flows from financing activities:
Capital (distributions to) contributions by member	(47,482)	15,920
Payments on debt	(7,603)	(10,170)
Payments on acquisition-related liabilities	(11,397)	(5,596)
Distributions	0	(2,500)
Other	(1,180)	(416)
Net cash used in financing activities	(67,662)	(2,762)
Impact of foreign currency on cash	177	140
Net decrease in cash	(93,569)	(58,440)
Cash and cash equivalents—beginning of period	380,961	418,181
Cash and cash equivalents—end of period	$ 287,392	$ 359,741