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	Jun. 24, 2012	Dec. 25, 2011
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 1,049	$ 1,583
Liability Derivatives	40	415
Foreign Currency Revenue Forecast Contracts [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	930	1,120
Liability Derivatives	0	0
Foreign Currency Forward Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	119	463
Liability Derivatives	40	415
Derivatives Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	930	1,120
Liability Derivatives	0	0
Derivatives Designated As Hedging Instruments [Member] | Foreign Currency Revenue Forecast Contracts [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	930	1,120
Derivatives Designated As Hedging Instruments [Member] | Foreign Currency Revenue Forecast Contracts [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	0	0
Derivatives Not Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	119	463
Liability Derivatives	40	415
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Currency Forward Exchange Contracts [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	119	463
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Currency Forward Exchange Contracts [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 40	$ 415