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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 30, 2017
Apr. 01, 2017
Commitments and Contingencies Disclosure [Abstract]      
Purchase Obligation, Due in Next Twelve Months $ 30,000    
Purchase Obligation, Due Second Year 0    
Letters of Credit Outstanding, Amount $ 42,800 $ 39,600 $ 39,500