Derivative Instruments And Hedging Activity (Schedule Of Derivative Instruments By Income Statement Location) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 26, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/(loss) recognized in earnings	$ 2,085		$ 4,132
Amount of gain/(loss) recognized in OCI	(395)		725
Amount of gain/(loss) reclassified from OCI into earnings	299		(234)
Miscellaneous Income (Expense), Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/(loss) reclassified from OCI into earnings	299
Commodity Contracts - Fuel [Member] | Cost Of Goods Sold And Occupancy Costs [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Percentage of derivative loss recognized in earnings	60.00%		60.00%
Commodity Contracts - Fuel [Member] | Cost Of Goods Sold And Occupancy Costs & Store And Warehouse Operating And Selling Expenses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/(loss) recognized in earnings	1,041	[1]	4,463	[1]
Commodity Contracts - Fuel [Member] | Store And Warehouse Operating And Selling Expenses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Percentage of derivative loss recognized in earnings	40.00%		40.00%
Foreign Exchange Contracts [Member] | Cost Of Goods Sold And Occupancy Costs [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/(loss) recognized in OCI	(395)		725
Amount of gain/(loss) reclassified from OCI into earnings			(234)
Foreign Exchange Contracts [Member] | Miscellaneous Income (Expense), Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/(loss) recognized in earnings	$ 1,044		$ (331)

[1] Approximately 60% of the amounts for 2012 and 2011 are reflected in cost of goods sold and occupancy costs. The remaining 40% of the amounts are reflected in store and warehouse operating and selling expenses.