Fair Value Measurements (Summary Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Apr. 01, 2012	Dec. 31, 2011	Mar. 27, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 997,669	$ 1,302,367	$ 593,344
Marketable securities	134,946	153,380	115,209
Derivatives, assets	6,345	16,443	18
Total assets measured at fair value	1,138,960	1,472,190	708,571
Derivatives, liabilities	2,234	5,136	24,787
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	997,669	1,302,367	593,344
Marketable securities			59,977
Total assets measured at fair value	997,669	1,302,367	653,321
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	134,946	153,380	55,232
Derivatives, assets	6,345	16,443	18
Total assets measured at fair value	141,291	169,823	55,250
Derivatives, liabilities	2,234	5,136	24,787
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents
Marketable securities
Derivatives, assets
Total assets measured at fair value
Derivatives, liabilities