Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Apr. 29, 2018	Apr. 30, 2017
Cash flows from operating activities:
Net income	$ 12,382	$ 11,821
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	12,453	11,301
Accretion of deferred financing costs and debt discount	136	146
Deferred income taxes	(15,614)	3,151
Share-based compensation and warrant costs	35,516	13,286
(Gain) loss on disposition of business operations and assets	(10)	436
Equity in net losses of equity method investments	31	0
Contingencies	0	(50)
Corporate owned life insurance, net	(254)	248
Changes in assets and liabilities:
Accounts receivable, net	(7,844)	(4,471)
Inventories	5,609	(11,292)
Other assets	(1,098)	3,265
Accounts payable	3,203	(4,147)
Accrued liabilities	(6,852)	(12,536)
Deferred revenue	(180)	299
Income taxes payable	(1,698)	(3,222)
Other liabilities	(751)	2,124
Net cash provided by operating activities	35,029	10,359
Cash flows from investing activities:
Proceeds from sales of property, plant and equipment	27	6
Purchase of property, plant and equipment	(4,935)	(5,175)
Purchase of investments	(5,490)	(4,750)
Proceeds from sale of investments	1,601	0
Net cash used in investing activities	(8,797)	(9,919)
Cash flows from financing activities:
Payments of term loans	(3,750)	(3,750)
Payment for employee share-based compensation payroll taxes	(5,769)	(3,467)
Proceeds from exercise of stock options	4,038	1,159
Repurchase of outstanding common stock	(25,325)	(9,966)
Net cash used in financing activities	(30,806)	(16,024)
Net decrease in cash and cash equivalents	(4,574)	(15,584)
Cash and cash equivalents at beginning of period	307,923	297,134
Cash and cash equivalents at end of period	303,349	281,550
Supplemental disclosure of cash flow information
Income taxes paid	648	1,869
Interest paid	1,929	1,809
Non-cash items
Capital expenditures in accounts payable	2,054	1,511
Convertible debt	$ 0	$ 2,175