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Derivative Financial Instruments (Tables)
12 Months Ended
Dec. 29, 2018
Derivative Financial Instruments  
Schedule of before-tax effect of derivative instruments not designated as hedging instruments

        The before-tax effect of derivative instruments not designated as hedging instruments was as follows (in thousands):

 
  Year Ended    
Gain (Loss) Recognized in Income
  December 29,
2018
  December 30,
2017
  December 31,
2016
  Location

Foreign currency forward contracts

  $ 105   $ (207 ) $ (92 ) Interest income and other, net