Fair Value Measurements (Summary Of Assets And Liabilities Measured at Fair Value) (Detail) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Mar. 30, 2014	Dec. 31, 2013	Mar. 31, 2013
Balance [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 602,421	$ 836,387	$ 790,252
Investments, Fair Value Disclosure	126,122	129,181	157,719
Derivative Asset, Current	105	1,932	11,737
Assets, Fair Value Disclosure	728,648	967,500	959,708
Derivatives, liabilities	3,681	3,925	2,165
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	359,438	516,173	584,249
Investments, Fair Value Disclosure	33,182	30,172	22,473
Derivative Asset, Current	0	0	0
Assets, Fair Value Disclosure	392,620	546,345	606,722
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	242,983	320,214	206,003
Investments, Fair Value Disclosure	92,940	99,009	135,246
Derivative Asset, Current	105	1,932	11,737
Assets, Fair Value Disclosure	336,028	421,155	352,986
Derivatives, liabilities	3,681	3,925	2,165
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