Fair Value Measurement, Financial Instruments And Risk Management (Fair Values Of Derivative Instruments Included Within The Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Sep. 27, 2015	Dec. 28, 2014
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 14	$ 55
Liability Derivatives	69	23
Foreign currency forward exchange contracts
Derivatives, Fair Value [Line Items]
Asset Derivatives	14	55
Liability Derivatives	69	23
Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Asset Derivatives	14	55
Liability Derivatives	69	23
Derivatives not designated as hedging instruments: | Foreign currency forward exchange contracts | Other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	14	55
Derivatives not designated as hedging instruments: | Foreign currency forward exchange contracts | Other current liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 69	$ 23