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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Revenue:      
Product $ 572,276us-gaap_SalesRevenueGoodsNet $ 465,424us-gaap_SalesRevenueGoodsNet $ 380,035us-gaap_SalesRevenueGoodsNet
Services 95,803us-gaap_SalesRevenueServicesNet 78,698us-gaap_SalesRevenueServicesNet 58,402us-gaap_SalesRevenueServicesNet
Total revenue 668,079us-gaap_Revenues 544,122us-gaap_Revenues 438,437us-gaap_Revenues
Cost of revenue:      
Cost of product 340,856us-gaap_CostOfGoodsSold 295,715us-gaap_CostOfGoodsSold 259,437us-gaap_CostOfGoodsSold
Cost of services 38,919us-gaap_CostOfServices 29,768us-gaap_CostOfServices 21,431us-gaap_CostOfServices
Total cost of revenue 379,775us-gaap_CostOfRevenue 325,483us-gaap_CostOfRevenue 280,868us-gaap_CostOfRevenue
Gross profit 288,304us-gaap_GrossProfit 218,639us-gaap_GrossProfit 157,569us-gaap_GrossProfit
Operating expenses:      
Research and development 133,484us-gaap_ResearchAndDevelopmentExpense 124,794us-gaap_ResearchAndDevelopmentExpense 117,233us-gaap_ResearchAndDevelopmentExpense
Sales and marketing 79,026us-gaap_SellingAndMarketingExpense 72,778us-gaap_SellingAndMarketingExpense 75,862us-gaap_SellingAndMarketingExpense
General and administrative 48,452us-gaap_GeneralAndAdministrativeExpense 45,253us-gaap_GeneralAndAdministrativeExpense 47,475us-gaap_GeneralAndAdministrativeExpense
Total operating expenses 260,962us-gaap_OperatingExpenses 242,825us-gaap_OperatingExpenses 240,570us-gaap_OperatingExpenses
Income (loss) from operations 27,342us-gaap_OperatingIncomeLoss (24,186)us-gaap_OperatingIncomeLoss (83,001)us-gaap_OperatingIncomeLoss
Other income (expense), net:      
Interest income 1,456us-gaap_InvestmentIncomeInterest 923us-gaap_InvestmentIncomeInterest 911us-gaap_InvestmentIncomeInterest
Interest expense (11,021)us-gaap_InterestExpense (6,061)us-gaap_InterestExpense 0us-gaap_InterestExpense
Other gain (loss), net (1,365)us-gaap_OtherNonoperatingIncomeExpense (1,141)us-gaap_OtherNonoperatingIncomeExpense (1,050)us-gaap_OtherNonoperatingIncomeExpense
Total other income (expense), net (10,930)us-gaap_NonoperatingIncomeExpense (6,279)us-gaap_NonoperatingIncomeExpense (139)us-gaap_NonoperatingIncomeExpense
Income (loss) before income taxes 16,412us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (30,465)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (83,140)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision for income taxes 2,753us-gaap_IncomeTaxExpenseBenefit 1,654us-gaap_IncomeTaxExpenseBenefit 2,190us-gaap_IncomeTaxExpenseBenefit
Net income (loss) $ 13,659us-gaap_NetIncomeLoss $ (32,119)us-gaap_NetIncomeLoss $ (85,330)us-gaap_NetIncomeLoss
Net income (loss) per common share:      
Basic (in usd per share) $ 0.11us-gaap_EarningsPerShareBasic $ (0.27)us-gaap_EarningsPerShareBasic $ (0.77)us-gaap_EarningsPerShareBasic
Diluted (in usd per share) $ 0.11us-gaap_EarningsPerShareDiluted $ (0.27)us-gaap_EarningsPerShareDiluted $ (0.77)us-gaap_EarningsPerShareDiluted
Weighted average shares used in computing net income (loss) per common share:      
Basic (in shares) 123,672us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 117,425us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 110,739us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive (in shares) 128,565us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 117,425us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 110,739us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding