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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Dec. 30, 2017
Income Tax Disclosure [Abstract]          
Income tax expense $ 745 $ 1,972 $ 2,407 $ 2,941  
Effective income tax rate 9.80% 28.70% 15.60% 20.90%  
Excess Tax Benefit from Share-based Compensation $ 1,200 $ 700 $ 1,500 $ 2,400  
Federal Statutory Income Tax Rate, Percent     21.00%   35.00%