Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Jan. 25, 2015	Jan. 26, 2014	Jan. 27, 2013
Net sales	$ 557,885us-gaap_SalesRevenueNet	$ 594,977us-gaap_SalesRevenueNet	$ 578,827us-gaap_SalesRevenueNet
Cost of sales	229,093	244,719	264,215
Cost of sales - lower of cost or market write-down	0us-gaap_InventoryWriteDown	15,047us-gaap_InventoryWriteDown	0us-gaap_InventoryWriteDown
Gross profit	328,792us-gaap_GrossProfit	335,211us-gaap_GrossProfit	314,612us-gaap_GrossProfit
Operating costs and expenses:
Selling, general and administrative	128,525	125,379	149,070
Product development and engineering	119,371us-gaap_ResearchAndDevelopmentExpense	137,437us-gaap_ResearchAndDevelopmentExpense	120,009us-gaap_ResearchAndDevelopmentExpense
Intangible amortization	25,718us-gaap_AmortizationOfIntangibleAssets	29,002us-gaap_AmortizationOfIntangibleAssets	29,244us-gaap_AmortizationOfIntangibleAssets
Intangible asset impairments	11,636	32,538	700
Goodwill impairment	0us-gaap_GoodwillImpairmentLoss	116,686us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss
Restructuring	1,285us-gaap_RestructuringCharges	3,086us-gaap_RestructuringCharges	0us-gaap_RestructuringCharges
Total operating costs and expenses	286,535us-gaap_OperatingExpenses	444,128us-gaap_OperatingExpenses	299,023us-gaap_OperatingExpenses
Operating income (loss)	42,257us-gaap_OperatingIncomeLoss	(108,917)us-gaap_OperatingIncomeLoss	15,589us-gaap_OperatingIncomeLoss
Interest expense	(5,927)us-gaap_InterestExpense	(18,174)us-gaap_InterestExpense	(14,363)us-gaap_InterestExpense
Interest income and other (expense) income, net	165us-gaap_OtherNonoperatingIncomeExpense	(1,390)us-gaap_OtherNonoperatingIncomeExpense	(977)us-gaap_OtherNonoperatingIncomeExpense
Income (loss) before taxes	36,495	(128,481)	249
Provision (benefit) for taxes	8,548us-gaap_IncomeTaxExpenseBenefit	35,985us-gaap_IncomeTaxExpenseBenefit	(41,690)us-gaap_IncomeTaxExpenseBenefit
Net income (loss)	$ 27,947us-gaap_ProfitLoss	$ (164,466)us-gaap_ProfitLoss	$ 41,939us-gaap_ProfitLoss
Earnings per share:
Basic (in dollars per share)	$ 0.42us-gaap_EarningsPerShareBasic	$ (2.44)us-gaap_EarningsPerShareBasic	$ 0.64us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 0.41us-gaap_EarningsPerShareDiluted	$ (2.44)us-gaap_EarningsPerShareDiluted	$ 0.62us-gaap_EarningsPerShareDiluted
Weighted average number of shares used in computing earnings per share:
Basic (in shares)	67,108	67,471	65,809
Diluted (in shares)	67,685	67,471	67,472

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