CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jul. 27, 2019	Jul. 25, 2020	Jul. 27, 2019
Cash flows from operating activities:
Net income	$ 29,896	$ 4,606	$ 44,175
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	47,244	90,001	93,586
Non-cash lease expense		15,743	14,804
Deferred income tax (benefit) provision		(15,893)	11,605
Stock-based compensation		6,694	5,756
Amortization of debt discount		6,089	9,947
Provision for bad debt (recovery), net	(202)	236	(10,514)
Gain on sale of fixed assets	(4,806)	(5,206)	(11,544)
Gain on debt extinguishment	0	(12,046)	0
Amortization of debt issuance costs and other		1,630	1,986
Goodwill impairment charge		53,264	0
Change in operating assets and liabilities, net of acquisitions:
Accounts receivable, net		(81,295)	(171,486)
Contract assets, net		(2,392)	(143,558)
Other current assets and inventories		2,417	(15,378)
Other assets		3,718	37,036
Income taxes receivable/payable		15,064	3,876
Accounts payable		64,547	21,645
Accrued liabilities, insurance claims, operating lease liabilities, and other liabilities		20,305	(1,674)
Net cash provided by (used in) operating activities		167,482	(109,738)
Cash flows from investing activities:
Capital expenditures		(26,724)	(83,944)
Proceeds from sale of assets		5,958	12,780
Other investing activities		0	306
Net cash used in investing activities		(20,766)	(70,858)
Cash flows from financing activities:
Proceeds from borrowings on senior credit agreement, including term loans		683,000	146,000
Principal payments on senior credit agreement, including term loans		(494,250)	(81,000)
Extinguishment of convertible senior notes	0	(401,736)
Redemption discount on convertible senior notes, net of costs	0	30,761
Settlement of convertible note hedges related to extinguished convertible debt	0	7,197
Purchase of warrants	0	(7,176)
Exercise of stock options		3,608	182
Restricted stock tax withholdings		(329)	(845)
Net cash provided by (used in) financing activities		(178,925)	64,337
Net decrease in cash and equivalents and restricted cash		(32,209)	(116,259)
Cash, cash equivalents and restricted cash at beginning of period		59,869	134,151
Cash, cash equivalents and restricted cash at end of period	$ 17,892	27,660	17,892
Supplemental disclosure of other cash flow activities and non-cash investing and financing activities:
Cash paid for interest		13,846	13,318
Cash paid for taxes, net		17,150	4,361
Purchases of capital assets included in accounts payable or other accrued liabilities at period end		$ 1,296	$ 5,288