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. 31, 2013	Dec. 30, 2012
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 0	$ 193
Liability Derivatives	111	208
Foreign Currency Revenue Forecast Contracts [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives		14
Foreign Currency Forward Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives		179
Liability Derivatives	111	208
Derivatives Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	0	14
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	0	14
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	0	179
Liability Derivatives	111	208
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Currency Forward Exchange Contracts [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	0	179
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Currency Forward Exchange Contracts [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 111	$ 208