Fair Value Measurements (Summary Of Assets And Liabilities Measured at Fair Value) (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Apr. 01, 2012
Fair Value Of Other Financial Instruments [Line Items]
Cash equivalents	$ 812,725	$ 852,979	$ 997,669
Marketable securities	135,246	135,634	134,946
Derivatives, assets	11,737	317	6,345
Total assets measured at fair value	959,708	988,930	1,138,960
Derivatives, liabilities	2,165	7,920	2,234
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value Of Other Financial Instruments [Line Items]
Cash equivalents	606,722	690,691	823,694
Marketable securities	0	0	0
Derivatives, assets	0	0	0
Total assets measured at fair value	606,722	690,691	823,694
Derivatives, liabilities	0	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value Of Other Financial Instruments [Line Items]
Cash equivalents	206,003	162,288	173,975
Marketable securities	135,246	135,634	134,946
Derivatives, assets	11,737	317	6,345
Total assets measured at fair value	352,986	298,239	315,266
Derivatives, liabilities	2,165	7,920	2,234
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