Fair Value Measurement, Financial Instruments And Risk Management (Amounts Affecting Consolidated Statement Of Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 24, 2012	Jun. 30, 2013	Jun. 24, 2012
Cash Flow Hedges [Member] | Foreign Currency Revenue Forecast Contracts [Member]
Fair Value Disclosures [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	$ (1)	$ 996	$ 0	$ 822
Amount of Forward Points Recognized in Other Gain (Loss), net	0	43	11	79
Cash Flow Hedges [Member] | Cost Of Sales [Member] | Foreign Currency Revenue Forecast Contracts [Member]
Fair Value Disclosures [Line Items]
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	5	(388)	(153)	(779)
Derivatives Not Designated As Hedging Instruments [Member] | Other Gain (Loss), Net [Member] | Foreign Exchange Forwards And Options [Member]
Fair Value Disclosures [Line Items]
Amount Gain (Loss) Recognized in Income on Derivatives	$ 52	$ 209	$ 265	$ 439