Fair Value Measurements (Summary Of Assets And Liabilities Measured at Fair Value) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 25, 2011
Fair Value Of Other Financial Instruments [Line Items]
Cash equivalents	$ 1,417,900	$ 1,302,367	$ 1,144,790
Marketable securities	136,376	153,380	179,285
Derivatives, assets	1,639	16,443	10,343
Total assets measured at fair value	1,555,915	1,472,190	1,334,418
Derivatives, liabilities	2,458	5,136	6,834
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value Of Other Financial Instruments [Line Items]
Cash equivalents	1,417,900	1,302,367	1,144,790
Marketable securities	0	0	0
Derivatives, assets	0	0	0
Total assets measured at fair value	1,417,900	1,302,367	1,144,790
Derivatives, liabilities	0	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value Of Other Financial Instruments [Line Items]
Cash equivalents	0	0	0
Marketable securities	136,376	153,380	179,285
Derivatives, assets	1,639	16,443	10,343
Total assets measured at fair value	138,015	169,823	189,628
Derivatives, liabilities	2,458	5,136	6,834
Significant Unobservable Inputs (Level 3) [Member]
Fair Value Of Other Financial Instruments [Line Items]
Cash equivalents	0	0	0
Marketable securities	0	0	0
Derivatives, assets	0	0	0
Total assets measured at fair value	0	0	0
Derivatives, liabilities	$ 0	$ 0	$ 0