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New Accounting Pronouncements New Accounting Pronouncements and Changes in Accounting Principles (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jul. 01, 2017 | Dec. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Prior Period Reclassification Adjustment | $ 0 | $ 0 | $ 595

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- Definition The amount of a reclassification adjustment made to prior period financial statement amounts. + References No definition available. + Details
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