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Income Taxes - Unrecognized Tax Losses (Details) - USD ($)
 12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Changes in the balances of gross unrecognized tax benefits    
Balance at beginning of period $ 1,059,000 $ 1,265,000
Additions for tax positions taken during prior years 9,000  
Reductions for tax positions taken during prior years   (21,000)
Additions for tax positions taken during the current year   82,000
Reductions as a result of a lapse of the applicable statute of limitations (37,000)  
Settlements with tax authorities   (267,000)
Balance at end of the period 1,031,000 $ 1,059,000
Interest accrued on unrecognized tax benefits 151,000  
Unrecognized tax benefits before adjustments 1,183,000  
Unrecognized tax benefits offset by future tax deduction 61,000  
Interest and penalties on unrecognized tax benefits 20,000  
Unrecognized tax benefits being recognized as a reduction to the effective income tax rate 1,000,000  
Amount of unrecognized tax benefits that was expected to be reversed within the next twelve months $ 289,000