Unaudited Consolidated Condensed Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 27, 2014	Apr. 28, 2013
Cash flows from operating activities:
Net income	$ 7,867	$ 14,777
Adjustments to reconcile net income to net cash provided by operating activities, net of effects of acquisitions:
Depreciation, amortization and impairments	12,004	13,346
Effect of acquisition fair value adjustments	0	2,476
Accretion of deferred financing costs and debt discount	250	760
Deferred income taxes	1	98
Stock-based compensation	6,847	8,626
Loss (gain) on disposition of property, plant and equipment	2	(1)
Changes in assets and liabilities:
Accounts receivable, net	4,611	(11,054)
Inventories	4,962	(4,016)
Prepaid expenses and other assets	(1,235)	(1,184)
Accounts payable	(1,352)	2,308
Accrued liabilities	(10,557)	(11,287)
Deferred revenue	(1,573)	1,251
Income taxes payable and prepaid taxes	154	(1,342)
Other liabilities	788	2,392
Net cash provided by operating activities	22,769	17,150
Cash flows from investing activities:
Purchases of available-for-sale investments	0	(1,050)
Proceeds from sales and maturities of available-for-sale investments	500	7,998
Proceeds from sales of property, plant and equipment	0	8
Purchase of property, plant and equipment	(6,379)	(10,750)
Purchase of intangible assets	0	(2,847)
Purchase of cost method investment	3,043	0
Net cash used in investing activities	(8,922)	(6,641)
Cash flows from financing activities:
Payment for employee stock-based compensation payroll taxes	(2,985)	(4,619)
Proceeds from exercises of stock options	1,785	6,971
Repurchase of outstanding common stock	(10,000)	0
Payment of long term debt	(4,687)	(5,625)
Net cash used in financing activities	(15,887)	(3,273)
Net (decrease) increase in cash and cash equivalents	(2,040)	7,236
Cash and cash equivalents at beginning of period	243,194	223,192
Cash and cash equivalents at end of period	$ 241,154	$ 230,428