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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Statement of Comprehensive Income [Abstract]      
Net income $ 67,974us-gaap_NetIncomeLoss $ 60,081us-gaap_NetIncomeLoss $ 78,094us-gaap_NetIncomeLoss
Other comprehensive loss – unrealized loss on available-for-sale marketable debt securities, net of income tax (47)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax (7)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax (5)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Comprehensive income $ 67,927us-gaap_ComprehensiveIncomeNetOfTax $ 60,074us-gaap_ComprehensiveIncomeNetOfTax $ 78,089us-gaap_ComprehensiveIncomeNetOfTax