CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Oct. 24, 2020	Oct. 30, 2021	Oct. 24, 2020
Cash flows from operating activities:
Net income	$ 33,926	$ 47,780	$ 38,532
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	42,313	115,307	132,313
Non-cash lease expense		23,865	23,480
Deferred income tax provision (benefit)		8,712	(20,478)
Stock-based compensation		7,838	10,490
Amortization of debt discount		1,665	6,732
Provision for bad debt, net	117	2,918	353
Gain on sale of fixed assets	(4,001)	(4,259)	(9,207)
Loss (gain) on debt extinguishment		62	(12,046)
Amortization of debt issuance costs and other		2,123	2,189
Goodwill impairment charge		0	53,264
Change in operating assets and liabilities:
Accounts receivable, net		(104,536)	(122,520)
Contract assets, net		86,267	48,568
Other current assets and inventories		(7,469)	20,670
Other assets		3,412	5,212
Income taxes receivable/payable		(12,177)	10,513
Accounts payable		13,215	68,731
Accrued liabilities, insurance claims, operating lease liabilities, and other liabilities		(21,610)	22,629
Net cash provided by operating activities		163,113	279,425
Cash flows from investing activities:
Capital expenditures		(113,477)	(36,110)
Proceeds from sale of assets		5,226	11,859
Net cash used in investing activities		(108,251)	(24,251)
Cash flows from financing activities:
Proceeds from Issuance of Senior Long-term Debt		500,000	0
Proceeds from borrowings on senior credit agreement, including term loan		95,000	773,000
Principal payments on senior credit agreement, including term loan		(271,875)	(704,875)
Debt issuance costs		(11,638)	0
Repurchase of common stock		(50,000)	0
Extinguishment of 2021 Convertible Notes	(401,736)	(58,264)
Redemption discount on convertible debt, net of costs	30,761	0
Settlement of convertible note hedges related to extinguished convertible debt	7,197	0
Purchase of warrants	(7,176)	0
Exercise of stock options		366	5,425
Restricted stock tax withholdings		(6,520)	(500)
Net cash provided by (used in) financing activities		197,069	(297,904)
Net increase (decrease) in cash, cash equivalents and restricted cash		251,931	(42,730)
Cash, cash equivalents and restricted cash at beginning of period (Note 7)		13,574	59,869
Cash, cash equivalents and restricted cash at end of period (Note 7)	$ 17,139	265,505	17,139
Supplemental disclosure of other cash flow activities and non-cash investing and financing activities:
Cash paid for interest		19,580	17,652
Cash paid for taxes, net		12,653	38,309
Purchases of capital assets included in accounts payable or other accrued liabilities at period end		$ 6,165	$ 3,726