Fair Value Measurement, Financial Instruments And Risk Management (Amounts Affecting Consolidated Statement Of Operations) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2011	Sep. 26, 2010	Sep. 25, 2011	Sep. 26, 2010
Foreign Currency Revenue Forecast Contracts [Member] | Cash Flow Hedges [Member]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	$ 1,390	$ (1,377)	$ (1,334)	$ 705
Amount of Forward Points Recognized in Other Gain (Loss), net	(188)	(2)	(293)	(28)
Foreign Currency Revenue Forecast Contracts [Member] | Cash Flow Hedges [Member] | Cost of Sales [Member]
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	(720)	724	(1,214)	734
Cash Flow Hedges [Member]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	1,390	(1,377)	(1,334)	876
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	(720)	724	(1,214)	575
Amount of Forward Points Recognized in Other Gain (Loss), net	(188)	(2)	(293)	(28)
Cash Flow Hedges [Member] | Interest Expense [Member] | Interest Rate Swap Contracts [Member]
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income				(159)
Cash Flow Hedges [Member] | Interest Rate Swap Contracts [Member]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives				171
Derivatives Not Designated As Hedging Instruments [Member] | Other Gain (Loss), Net [Member] | Foreign Exchange Forwards And Options [Member]
Amount Gain (Loss) Recognized in Income on Derivatives	$ 185	$ (384)	$ (216)	$ 32