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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
Sep. 29, 2018
Dec. 30, 2017
Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]      
Purchase Obligation, Due in Next Twelve Months $ 20,000    
Purchase Obligation, Due Second Year 0    
Letters of Credit Outstanding, Amount $ 36,700 $ 39,600 $ 41,600