Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Oct. 28, 2018	Oct. 29, 2017
Cash flows from operating activities:
Net income	$ 49,716	$ 37,723
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	37,332	35,794
Impairment of investments	30,000	4,250
Accretion of deferred financing costs and debt discount	399	430
Deferred income taxes	(19,001)	5,508
Share-based compensation and warrant costs	60,947	44,166
Loss on disposition of business operations and assets	(68)	283
Earn-out liabilities	(9,419)	188
Equity in net losses of equity method investments	41	204
Gain from convertible debt settlement	0	(4,275)
Corporate owned life insurance, net	41	843
Changes in assets and liabilities:
Accounts receivable, net	(26,096)	(14,726)
Inventories	10,754	(5,697)
Other assets	1,377	(2,618)
Accounts payable	5,329	(6,683)
Accrued liabilities	(2,538)	(7,808)
Deferred revenue	(488)	(55)
Income taxes payable	(1,697)	(17,520)
Other liabilities	(264)	2,843
Net cash provided by operating activities	136,365	72,850
Cash flows from investing activities:
Proceeds from convertible debt settlement	0	5,700
Proceeds from sales of property, plant and equipment	112	180
Purchase of property, plant and equipment	(12,928)	(26,818)
Purchase of investments	(6,701)	(13,337)
Acquisition, net of cash acquired	(7,265)	(17,619)
Proceeds from sale of investments	1,601	0
Net cash used in investing activities	(25,181)	(51,894)
Cash flows from financing activities:
Payments of term loans	(11,250)	(11,250)
Payment of earn-out	(8,530)	0
Payment for employee share-based compensation payroll taxes	(17,802)	(10,661)
Proceeds from exercise of stock options	10,449	5,340
Repurchase of outstanding common stock	(79,738)	(10,394)
Net cash used in financing activities	(106,871)	(26,965)
Net increase (decrease) in cash and cash equivalents	4,313	(6,009)
Cash and cash equivalents at beginning of period	307,923	297,134
Cash and cash equivalents at end of period	312,236	291,125
Supplemental disclosure of cash flow information
Income taxes paid	4,042	24,632
Interest paid	5,705	5,197
Non-cash items
Capital expenditures in accounts payable	$ 2,178	$ 4,417