Fair Value Measurement, Financial Instruments And Risk Management (Amounts Affecting Consolidated Statement Of Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 23, 2012	Sep. 25, 2011	Sep. 23, 2012	Sep. 25, 2011
Cash Flow Hedges [Member]
Fair Value Disclosures [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	$ (298)	$ 1,390	$ 524	$ (1,334)
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	543	(720)	1,322	(1,214)
Amount of Forward Points Recognized in Other Gain (Loss), net	11	(188)	89	(293)
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	(298)	1,390	524	(1,334)
Amount of Forward Points Recognized in Other Gain (Loss), net	11	(188)	89	(293)
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	543	(720)	1,322	(1,214)
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	$ (81)	$ 185	$ 193	$ (216)