Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jul. 26, 2015	Jul. 27, 2014
Cash flows from operating activities:
Net (loss) income	$ (455)	$ 25,765
Adjustments to reconcile net (loss) income to net cash provided by operating activities, net of effects of acquisitions:
Depreciation, amortization and impairments	24,020	24,030
Accretion of deferred financing costs and debt discount	660	511
Deferred income taxes	(430)	3,143
Stock-based compensation	8,282	13,121
Earn-out liabilities	568	(46)
Environmental reserve	2,855	0
Loss (gain) on disposition of property, plant and equipment	23	(14)
Changes in assets and liabilities:
Accounts receivable, net	7,977	(2,135)
Inventories	(6,335)	5,816
Prepaid expenses and other assets	988	(4,247)
Accounts payable	15,960	(2,544)
Accrued liabilities	(9,353)	(1,681)
Deferred revenue	1,042	(840)
Income taxes payable and prepaid taxes	1,398	(1,839)
Other liabilities	1,546	2,097
Net cash provided by operating activities	48,746	61,137
Cash flows from investing activities:
Proceeds from sales and maturities of available-for-sale investments	0	3,124
Proceeds from sales of property, plant and equipment	0	71
Purchase of property, plant and equipment	(8,244)	(12,662)
Purchase of intangible assets	0	(1,000)
Acquisitions, net of cash acquired	(34,932)	0
Purchases of other investments	(3,230)	(3,264)
Proceeds from sale of equity investments	5,261	0
Net cash used in investing activities	(41,145)	(13,731)
Cash flows from financing activities:
Borrowings under line of credit	35,000	0
Payment for employee stock-based compensation payroll taxes	(4,073)	(3,533)
Proceeds from exercises of stock options	2,968	5,975
Repurchase of outstanding common stock	(49,847)	(20,000)
Payment of long term debt	(9,375)	(34,375)
Net cash used in financing activities	(25,327)	(51,933)
Net decrease in cash and cash equivalents	(17,726)	(4,527)
Cash and cash equivalents at beginning of period	230,328	243,194
Cash and cash equivalents at end of period	$ 212,602	$ 238,667