Fair Value Measurement, Financial Instruments And Risk Management (Amounts Affecting Consolidated Statement Of Operations) (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2015	Dec. 28, 2014	Dec. 29, 2013
Cost of sales | Foreign currency revenue forecast contracts
Fair Value Disclosures [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	$ (125)	$ 0	$ 0
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	0	0	(161)
Amount of Forward Points Recognized in Other Gain (Loss), net	(10)	0	11
Other gain (loss), net | Foreign exchange forwards and options
Fair Value Disclosures [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	$ 613	$ 425	$ (404)