Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jul. 31, 2016	Jul. 26, 2015
Cash flows from operating activities:
Net income (loss)	$ 15,866	$ (455)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization and impairments	23,887	24,020
Accretion of deferred financing costs and debt discount	332	660
Deferred income taxes	9,495	(430)
Stock-based compensation	11,804	8,282
Earn-out liabilities	(162)	568
Environmental reserve	(66)	2,855
Loss on disposition of property, plant and equipment	66	23
Changes in assets and liabilities:
Accounts receivable, net	(12,821)	7,977
Inventories	1,374	(6,335)
Prepaid expenses and other assets	(12,643)	988
Accounts payable	3,170	15,960
Accrued liabilities	5,070	(9,353)
Deferred revenue	1,182	1,042
Income taxes payable and prepaid taxes	(4,859)	1,398
Other liabilities	3,772	1,546
Net cash provided by operating activities	45,467	48,746
Cash flows from investing activities:
Purchase of property, plant and equipment	(5,348)	(8,244)
Acquisitions, net of cash acquired	0	(34,932)
Purchases of other investments	(1,248)	(3,230)
Proceeds from sale of equity investments	0	5,261
Net cash used in investing activities	(6,596)	(41,145)
Cash flows from financing activities:
Borrowings under line of credit	0	35,000
Payment for employee stock-based compensation payroll taxes	(2,849)	(4,073)
Proceeds from exercises of stock options	968	2,968
Repurchase of outstanding common stock	(539)	(49,847)
Payment of long term debt	(9,374)	(9,375)
Net cash used in financing activities	(11,794)	(25,327)
Net increase (decrease) in cash and cash equivalents	27,077	(17,726)
Cash and cash equivalents at beginning of period	211,810	230,328
Cash and cash equivalents at end of period	$ 238,887	$ 212,602