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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jan. 02, 2016 | Jan. 03, 2015 | Dec. 28, 2013
Income Tax Disclosure [Abstract] |  |  |
Federal statutory tax expense | $ 55,020 | $ 36,836 | $ 33,957
State taxes, net of federal tax effect | 4,269 | 4,118 | 2,469
Credit for increasing research activities | (3,320) | (2,569) | (1,338)
Deduction related to domestic production activities | (3,320) | (1,751) | (1,396)
Valuation allowance | 0 | 2,474 | 0
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount | 0 | 4,298 | 0
Uncertain tax positions | (1,344) | 1,099 | 773
Other - net | 459 | (729) | (1,127)
Total income tax expense | $ 51,764 | $ 43,776 | $ 33,338

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