Stockholders' Equity (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Amounts Reclassified from AOCI
Rent expense	$ (4,200)us-gaap_LeaseAndRentalExpense	$ (4,200)us-gaap_LeaseAndRentalExpense	$ (4,400)us-gaap_LeaseAndRentalExpense
Interest expense	(3,154)us-gaap_InterestExpense	(3,293)us-gaap_InterestExpense	(1,149)us-gaap_InterestExpense
Investment Income, Interest	1,007us-gaap_InvestmentIncomeInterest	853us-gaap_InvestmentIncomeInterest	1,338us-gaap_InvestmentIncomeInterest
Income before income taxes	49,040	62,027	86,348
Income tax benefit	(11,019)us-gaap_IncomeTaxExpenseBenefit	(12,208)us-gaap_IncomeTaxExpenseBenefit	(22,800)us-gaap_IncomeTaxExpenseBenefit
Net income	38,021	49,819	63,548
Net changes to available-for-sale securities:
Unrealized gains (losses) arising during the period	(387)	187	(350)
Reclassification for gains included in net income		81
Net changes to cash flow hedges
Unrealized gains (losses) arising during the period	279	(214)	335
Reclassification for losses included in net income	(216)	(196)	(803)
Other comprehensive income	(324)	(142)	(818)
Reclassifications From Accumulated Other Comprehensive Loss
Amounts Reclassified from AOCI
Income before income taxes	(618)	(328)	(2,295)
Income tax benefit	216	115	803
Net income	(402)	(213)	(1,492)
Unrealized Gain on Cash Flow Hedge \| Reclassifications From Accumulated Other Comprehensive Loss
Amounts Reclassified from AOCI
Rent expense			(2,295)
Interest expense	(618)	(560)
Net Unrealized Losses on Available-For-Sale Securities \| Reclassifications From Accumulated Other Comprehensive Loss
Amounts Reclassified from AOCI
Investment Income, Interest		$ 232

Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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Amount of tax expense (benefit) allocated to other comprehensive income (loss) attributable to parent entity.

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Amount of tax expense (benefit) before reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.

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