Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jan. 27, 2019	Jan. 28, 2018	Jan. 29, 2017
Cash flows from operating activities:
Net income	$ 63,056	$ 36,426	$ 54,661
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	49,639	48,999	47,057
Impairment of investments	30,000	4,250	0
Accretion of deferred financing costs and debt discount	528	568	621
Write-off of deferred financing cost and debt discount	0	0	549
Deferred income taxes	(16,486)	15,232	2,185
Share-based compensation and warrant costs	73,859	47,936	30,828
Loss (gain) on disposition of business operations and assets (Note 1)	(26)	276	(25,489)
Earn-out liabilities	(9,419)	3,892	(215)
Equity in net losses of equity method investments	126	254	0
Gain from sale of investment	(1,288)	0	0
Gain from convertible debt settlement	0	(4,275)	0
Contingencies	0	0	(1,518)
Corporate owned life insurance, net	(34)	1,601	770
Changes in assets and liabilities:
Accounts receivable, net	(21,499)	(1,453)	(7,403)
Inventories	8,444	(5,515)	(1,959)
Other assets	(587)	(5,957)	(7,516)
Accounts payable	7,543	(5,306)	3,101
Accrued liabilities	(1,862)	2,474	10,582
Deferred revenue	1,986	(26)	4,533
Income taxes payable	408	(15,718)	2,618
Other liabilities	(825)	(12,173)	4,207
Net cash provided by operating activities	183,563	111,485	117,612
Cash flows from investing activities:
Proceeds from convertible debt settlement	0	5,700	0
Proceeds from sales of property, plant and equipment	112	189	48
Purchase of property, plant and equipment	(17,052)	(35,461)	(32,920)
Purchase of investments	(9,297)	(18,665)	(13,198)
Acquisitions, net of cash acquired	(15,948)	(17,619)	0
Proceeds from disposition of business operations	0	0	32,000
Proceeds from sale of investments	5,967	0	555
Net cash used in investing activities	(36,218)	(65,856)	(13,515)
Cash flows from financing activities:
Proceeds from term loans	0	0	150,000
Payments of term loans	(15,938)	(15,000)	(80,875)
Proceeds from revolving line of credit	0	0	97,000
Payments of revolving line of credit	0	0	(181,000)
Deferred financing costs	0	0	(2,110)
Payment of earn-out	(8,736)	0	0
Payment for employee share-based compensation payroll taxes	(18,539)	(11,671)	(6,562)
Proceeds from exercise of stock options	16,275	6,680	5,779
Repurchase of outstanding common stock	(116,210)	(14,849)	(1,005)
Net cash used in financing activities	(143,148)	(34,840)	(18,773)
Net increase in cash and cash equivalents	4,197	10,789	85,324
Cash and cash equivalents at beginning of period	307,923	297,134	211,810
Cash and cash equivalents at end of period	312,120	307,923	297,134
Supplemental disclosure of cash flow information
Income taxes paid	7,740	31,013	10,503
Interest paid	8,588	6,341	6,492
Non-cash items
Capital expenditures in accounts payable	2,024	3,789	3,373
Conversion of note into equity	$ 500	$ 0	$ 0