Fair Value Measurements (Summary Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Thousands	Sep. 25, 2011	Dec. 31, 2010	Sep. 26, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 1,144,790		$ 1,091,200
Marketable securities	179,285	140,118	55,229
Derivatives, Assets	10,343		2,169
Total assets measured at fair value	1,334,418		1,148,598
Derivatives, Liabilities	6,834		19,924
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1,144,790		1,091,200
Total assets measured at fair value	1,144,790		1,091,200
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	179,285		55,229
Derivatives, Assets	10,343		2,169
Total assets measured at fair value	189,628		57,398
Derivatives, Liabilities	$ 6,834		$ 19,924