Fair Value Measurement, Financial Instruments And Risk Management (Fair Values Of Derivative Instruments Included Within The Consolidated Balance Sheets) (Details) (USD $) In Thousands	Sep. 25, 2011	Dec. 26, 2010
Derivative Assets, Fair Value	$ 1,429	$ 965
Derivative Liabilities, Fair Value	345	298
Other Current Assets [Member] | Foreign Currency Revenue Forecast Contracts [Member] | Derivatives Designated As Hedging Instruments [Member]
Derivative Assets, Fair Value	859	938
Other Current Liabilities [Member] | Foreign Currency Revenue Forecast Contracts [Member] | Derivatives Designated As Hedging Instruments [Member]
Derivative Liabilities, Fair Value	92	278
Derivatives Designated As Hedging Instruments [Member]
Derivative Assets, Fair Value	859	938
Derivative Liabilities, Fair Value	92	278
Other Current Assets [Member] | Foreign Currency Forward Exchange Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative Assets, Fair Value	570	27
Other Current Liabilities [Member] | Foreign Currency Forward Exchange Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative Liabilities, Fair Value	253	20
Derivatives Not Designated As Hedging Instruments [Member]
Derivative Assets, Fair Value	570	27
Derivative Liabilities, Fair Value	253	20
Foreign Currency Revenue Forecast Contracts [Member]
Derivative Assets, Fair Value	859	938
Derivative Liabilities, Fair Value	92	278
Foreign Currency Forward Exchange Contracts [Member]
Derivative Assets, Fair Value	570	27
Derivative Liabilities, Fair Value	$ 253	$ 20