Derivative Instruments And Hedging Activities (Gain Loss On Derivative Cash Flow Hedges Recognized In OCI) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 25, 2011	Sep. 30, 2012	Sep. 25, 2011
Derivative Instruments And Hedging Activities [Line Items]
Amount of Gain/(Loss) Recognized in OCI	$ 1,717	$ 8,614	$ 5,363	$ (8,976)
Interest Rate Swaps Unsecured Commercial Paper [Member]
Derivative Instruments And Hedging Activities [Line Items]
Amount of Gain/(Loss) Recognized in OCI	(19)	(237)	(43)	(642)
Foreign Currency Contracts [Member]
Derivative Instruments And Hedging Activities [Line Items]
Amount of Gain/(Loss) Recognized in OCI	1,704	9,051	5,799	(7,870)
Natural Gas Contracts [Member]
Derivative Instruments And Hedging Activities [Line Items]
Amount of Gain/(Loss) Recognized in OCI	$ 32	$ (200)	$ (393)	$ (464)