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Income Taxes - Unrecognized Tax Losses (Details) - USD ($)
 12 Months Ended
Jan. 02, 2016
Jan. 03, 2015
Changes in the balances of gross unrecognized tax benefits    
Balance at beginning of period $ 535,000 $ 372,000
Additions for tax positions taken during prior years   127,000
Additions for tax positions taken during the current year 892,000 45,000
Settlements with tax authorities (162,000) (9,000)
Balance at end of the period 1,265,000 535,000
Interest accrued on unrecognized tax benefits 91,000  
Unrecognized tax benefits before adjustments 1,356,000  
Unrecognized tax benefits offset by future tax deduction 86,000  
Interest and penalties on unrecognized tax benefits 18,000 $ 85,000
Unrecognized tax benefits being recognized as a reduction to the effective income tax rate 855,000  
Amount of unrecognized tax benefits that is reasonably possible to be reversed within the next twelve months 195,000  
Additional disclosures    
Undistributed earnings from foreign subsidiaries $ 3,400,000