Fair Value Measurements (Schedule Of Assets And Liabilities Measured At Fair Value) (Details) (Level 2 [Member], USD $) In Thousands	Sep. 24, 2011	Dec. 25, 2010	Sep. 25, 2010
Foreign Exchange Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Category, Assets	$ 952
Fair Value Measurement Category, Liabilities	38	434	304
Commodity Contracts - Fuel [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Category, Assets	$ 725	$ 253