Fair Value Measurement, Financial Instruments And Risk Management (Fair Values Of Derivative Instruments Included Within The Consolidated Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 25, 2012	Dec. 25, 2011
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	$ 578	$ 1,583
Derivative Liabilities, Fair Value	62	415
Foreign Currency Revenue Forecast Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	573	1,120
Derivative Liabilities, Fair Value	29
Foreign Currency Forward Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	5	463
Derivative Liabilities, Fair Value	33	415
Derivatives Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	573	1,120
Derivative Liabilities, Fair Value	29
Derivatives Designated As Hedging Instruments [Member] | Foreign Currency Revenue Forecast Contracts [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	573	1,120
Derivatives Designated As Hedging Instruments [Member] | Foreign Currency Revenue Forecast Contracts [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value	29
Derivatives Not Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	5	463
Derivative Liabilities, Fair Value	33	415
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Currency Forward Exchange Contracts [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, Fair Value	5	463
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Currency Forward Exchange Contracts [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value	$ 33	$ 415