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. 24, 2012	Jun. 26, 2011	Jun. 24, 2012	Jun. 26, 2011
Cash Flow Hedges [Member]
Fair Value Disclosures [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income on Derivatives	$ 996	$ (354)	$ 822	$ (2,725)
Amount of Gain (Loss) Reclassified From Accumulated Other Comprehensive Income into Income	(388)	(276)	(779)	(494)
Amount of Forward Points Recognized in Other Gain (Loss), net	43	(124)	79	(105)
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	996	(354)	822	(2,725)
Amount of Forward Points Recognized in Other Gain (Loss), net	43	(124)	79	(105)
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	(388)	(276)	(779)	(494)
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	$ 209	$ (158)	$ 439	$ (495)