Fair Value Measurements (Summary Of Assets And Liabilities Measured at Fair Value) (Detail) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Jun. 29, 2014	Dec. 31, 2013	Jun. 30, 2013
Balance [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 660,520	$ 836,387	$ 1,070,329
Investments, Fair Value Disclosure	91,381	129,181	155,824
Derivative Asset, Current	3,159	1,932	11,214
Assets, Fair Value Disclosure	755,060	967,500	1,237,367
Derivatives, liabilities	1,478	3,925	570
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	482,780	516,173	620,947
Investments, Fair Value Disclosure	33,567	30,172	22,193
Derivative Asset, Current	0	0	0
Assets, Fair Value Disclosure	516,347	546,345	643,140
Derivatives, liabilities	0	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	177,740	320,214	449,382
Investments, Fair Value Disclosure	57,814	99,009	133,631
Derivative Asset, Current	3,159	1,932	11,214
Assets, Fair Value Disclosure	238,713	421,155	594,227
Derivatives, liabilities	1,478	3,925	570
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0	0
Investments, Fair Value Disclosure	0	0	0
Derivative Asset, Current	0	0	0
Assets, Fair Value Disclosure	0	0	0
Derivatives, liabilities	$ 0	$ 0	$ 0