CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Jan. 30, 2021	Jan. 25, 2020	Jan. 26, 2019
Cash flows from operating activities:
Net Income	$ 34,337	$ 57,215	$ 62,907
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	175,897	187,556	179,603
Non-cash lease expense	31,828	30,043	0
Non-cash lease expense	(28,185)	9,261	8,523
Stock-based compensation	12,771	10,034	20,187
Provision for bad debt (recovery), net	406	(6,540)	17,071
Gain on sale of fixed assets	(10,026)	(14,879)	(19,390)
(Gain) loss on debt extinguishment	(12,046)	76	0
Amortization of debt discount	7,441	20,112	19,103
Amortization of debt issuance costs and other	2,797	4,023	3,686
Goodwill impairment charge	53,264	0	0
Change in operating assets and liabilities, net of acquisitions:
Accounts receivable, net	(41,755)	(195,796)	(30,750)
Contract assets, net	53,664	(35,888)	(149,828)
Other current assets and inventories	27,316	(6,960)	(15,842)
Other assets	9,178	41,068	(25,110)
Income taxes receivable/payable	7,505	(84)	10,357
Accounts payable	43,747	(2,141)	20,064
Accrued liabilities, insurance claims, operating lease liabilities, and other liabilities	13,638	(39,101)	23,866
Net cash provided by operating activities	381,777	57,999	124,447
Cash flows from investing activities:
Capital expenditures	(58,047)	(120,574)	(164,963)
Proceeds from sale of assets	13,419	19,045	22,949
Cash paid for acquisitions, net of cash acquired	0	0	(20,917)
Other investing activities	0	306	1,576
Net cash used in investing activities	(44,628)	(101,223)	(161,355)
Cash flows from financing activities:
Proceeds from borrowings on senior credit agreement, including term loans	1,056,000	475,000	423,188
Principal payments on senior credit agreement, including term loans	(973,500)	(480,625)	(331,250)
Debt financing costs	0	0	(7,275)
Repurchase of common stock	(100,000)	0	0
Extinguishment of 0.75% senior notes	(401,736)	(25,000)	0
Redemption discount on convertible debt, net of costs	30,761	675	0
Settlement of convertible note hedges related to extinguished convertible debt	7,197	388	0
Purchase of warrants	(7,176)	(301)	0
Exercise of stock options	5,738	503	871
Restricted stock tax withholdings	(728)	(1,698)	(4,657)
Net cash (used in) provided by financing activities	(383,444)	(31,058)	80,877
Net (decrease) increase in cash, cash equivalents and restricted cash	(46,295)	(74,282)	43,969
Cash, cash equivalents and restricted cash at beginning of period	59,869	134,151	90,182
Cash, cash equivalents and restricted cash at end of period	13,574	59,869	134,151
Supplemental disclosure of other cash flow activities and non-cash investing and financing activities:
Cash paid for interest	20,653	26,655	22,312
Cash paid for taxes, net	45,332	12,017	6,396
Purchases of capital assets included in accounts payable or other accrued liabilities at period end	$ 6,556	$ 8,814	$ 6,795