Fair Value Measurements (Summary Of Assets And Liabilities Measured at Fair Value) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jul. 01, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	$ 133,631	$ 135,634	$ 135,848
Fair Value, Measurements, Recurring [Member] | Balance [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1,092,522	852,979	764,147
Marketable securities	133,631	135,634	135,848
Derivative Asset, Current	11,214	317	8,879
Total assets measured at fair value	1,237,367	988,930	908,874
Derivatives, liabilities	570	7,920	2,042
Fair Value, Measurements, Recurring [Member] | 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	643,140	690,691	578,567
Marketable securities	0	0	0
Derivative Asset, Current	0	0	0
Total assets measured at fair value	643,140	690,691	578,567
Derivatives, liabilities	0	0	0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	449,382	162,288	185,580
Marketable securities	133,631	135,634	135,848
Derivative Asset, Current	11,214	317	8,879
Total assets measured at fair value	594,227	298,239	330,307
Derivatives, liabilities	570	7,920	2,042
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0	0
Marketable securities	0	0	0
Derivative Asset, Current	0	0	0
Total assets measured at fair value	0	0	0
Derivatives, liabilities	$ 0	$ 0	$ 0