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Significant Accounting Policies (Foreign Transaction Gains and Losses) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Foreign currency transaction gains $ 7,849 $ 8,729 $ 32,611