Fair Value Measurement, Financial Instruments And Risk Management (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Thousands	Sep. 25, 2011	Dec. 26, 2010
Assets	$ 1,429	$ 965
Liabilities	345	298
Foreign Currency Revenue Forecast Contracts [Member]
Assets	859	938
Liabilities	92	278
Foreign Currency Revenue Forecast Contracts [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Assets
Liabilities
Foreign Currency Revenue Forecast Contracts [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets	859	938
Liabilities	92	278
Foreign Currency Revenue Forecast Contracts [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets
Liabilities
Foreign Currency Forward Exchange Contracts [Member]
Assets	570	27
Liabilities	253	20
Foreign Currency Forward Exchange Contracts [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Assets
Liabilities
Foreign Currency Forward Exchange Contracts [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets	570	27
Liabilities	253	20
Foreign Currency Forward Exchange Contracts [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets
Liabilities
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Assets
Liabilities
Significant Other Observable Inputs (Level 2) [Member]
Assets	1,429	965
Liabilities	345	298
Significant Unobservable Inputs (Level 3) [Member]
Assets
Liabilities