Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 26, 2015	Apr. 27, 2014
Cash flows from operating activities:
Net (loss) income	$ (142)	$ 7,867
Adjustments to reconcile net (loss) income to net cash provided by operating activities, net of effects of acquisitions:
Depreciation, amortization and impairments	12,040	12,004
Accretion of deferred financing costs and debt discount	313	250
Deferred income taxes	(390)	1
Stock-based compensation	5,946	6,847
Loss on disposition of property, plant and equipment	0	2
Changes in assets and liabilities:
Accounts receivable, net	(16,359)	4,611
Inventories	(873)	4,962
Prepaid expenses and other assets	(4,684)	(1,235)
Accounts payable	21,613	(1,352)
Accrued liabilities	(8,095)	(10,557)
Deferred revenue	1,045	(1,573)
Income taxes payable and prepaid taxes	1,205	154
Other liabilities	3,078	788
Net cash provided by operating activities	14,697	22,769
Cash flows from investing activities:
Proceeds from sales and maturities of available-for-sale investments	0	500
Purchase of property, plant and equipment	(4,841)	(6,379)
Acquisitions, net of cash acquired	(34,932)	0
Purchases of other investments	(2,230)	(3,043)
Net cash used in investing activities	(42,003)	(8,922)
Cash flows from financing activities:
Borrowings under line of credit	35,000	0
Payment for employee stock-based compensation payroll taxes	(3,602)	(2,985)
Proceeds from exercises of stock options	1,785	1,785
Repurchase of outstanding common stock	(20,014)	(10,000)
Payment of long term debt	(4,687)	(4,687)
Net cash provided by (used in) financing activities	8,482	(15,887)
Net decrease in cash and cash equivalents	(18,824)	(2,040)
Cash and cash equivalents at beginning of period	230,328	243,194
Cash and cash equivalents at end of period	$ 211,504	$ 241,154