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Income Taxes (Details) - USD ($)
4 Months Ended 9 Months Ended 12 Months Ended
Oct. 07, 2018
Oct. 08, 2017
Oct. 07, 2018
Oct. 08, 2017
Dec. 31, 2017
Income Taxes          
U.S. corporate tax rate     21.00%   35.00%
Percentage of deduction from using foreign tax credits to offset the income tax liability     50.00%    
Effective tax rate (as a percent)     3.10% 5.20%  
Income tax expense (benefit) $ (200,000) $ 2,605,000 $ 305,000 $ 419,000  
Income before income taxes $ 9,960,000 $ 7,711,000 9,972,000 $ 8,061,000  
Tax benefit from measurement period adjustments to the federal transition tax liability     $ 153,000