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New Accounting Pronouncements New Accounting Pronouncements and Changes in Accounting Principles (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Dec. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]      
Prior Period Reclassification Adjustment $ 0 $ 0 $ 595