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Consolidated Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Condensed Consolidated Statements of Income      
Revenues $ 620,704us-gaap_SalesRevenueNet $ 580,087us-gaap_SalesRevenueNet $ 563,294us-gaap_SalesRevenueNet
Cost of revenues 242,153us-gaap_CostOfGoodsSold 227,183us-gaap_CostOfGoodsSold 225,277us-gaap_CostOfGoodsSold
Gross margin 378,551us-gaap_GrossProfit 352,904us-gaap_GrossProfit 338,017us-gaap_GrossProfit
Operating expenses:      
Research and development 172,985us-gaap_ResearchAndDevelopmentExpense 157,799us-gaap_ResearchAndDevelopmentExpense 137,952us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative 154,145us-gaap_SellingGeneralAndAdministrativeExpense 130,795us-gaap_SellingGeneralAndAdministrativeExpense 114,390us-gaap_SellingGeneralAndAdministrativeExpense
Operating expenses 327,130us-gaap_OperatingExpenses 288,594us-gaap_OperatingExpenses 252,342us-gaap_OperatingExpenses
Operating income 51,421us-gaap_OperatingIncomeLoss 64,310us-gaap_OperatingIncomeLoss 85,675us-gaap_OperatingIncomeLoss
Other income (expense):      
Interest income 1,007us-gaap_InvestmentIncomeInterest 853us-gaap_InvestmentIncomeInterest 1,338us-gaap_InvestmentIncomeInterest
Interest expense (3,154)us-gaap_InterestExpense (3,293)us-gaap_InterestExpense (1,149)us-gaap_InterestExpense
Other income (expense), net (234)us-gaap_OtherNonoperatingIncomeExpense 157us-gaap_OtherNonoperatingIncomeExpense 484us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes 49,040us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 62,027us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 86,348us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision for income taxes 11,019us-gaap_IncomeTaxExpenseBenefit 12,208us-gaap_IncomeTaxExpenseBenefit 22,800us-gaap_IncomeTaxExpenseBenefit
Net income $ 38,021us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 49,819us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 63,548us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Earnings per share:      
Basic (in dollars per share) $ 0.88us-gaap_EarningsPerShareBasic $ 1.17us-gaap_EarningsPerShareBasic $ 1.51us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) $ 0.87us-gaap_EarningsPerShareDiluted $ 1.14us-gaap_EarningsPerShareDiluted $ 1.47us-gaap_EarningsPerShareDiluted
Weighted-average common shares outstanding:      
Basic (in shares) 42,970us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 42,715us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 42,136us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares) 43,793us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 43,537us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 43,106us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding