Fair Value Measurements (Summary Of Assets And Liabilities Measured at Fair Value) (Detail) - USD ($) $ in Thousands	Sep. 27, 2015	Dec. 31, 2014	Sep. 28, 2014
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Repossessed Assets	$ 16,600	$ 13,400	$ 13,500
Fair Value, Measurements, Recurring [Member] | Balance [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1,111,571	737,024	687,259
Investments, Fair Value Disclosure	82,616	91,140	90,306
Derivative Asset, Current	18,015	32,244	24,908
Assets, Fair Value Disclosure	1,212,202	860,408	802,473
Derivatives, liabilities	1,309	2,027	441
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	719,854	482,686	366,942
Investments, Fair Value Disclosure	35,258	33,815	32,727
Derivative Asset, Current	0	0	0
Assets, Fair Value Disclosure	755,112	516,501	399,669
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	391,717	254,338	320,317
Investments, Fair Value Disclosure	47,358	57,325	57,579
Derivative Asset, Current	18,015	32,244	24,908
Assets, Fair Value Disclosure	457,090	343,907	402,804
Derivatives, liabilities	1,309	2,027	441
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
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
Fair value, adjustment [Domain]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Repossessed Assets	$ 6,700	$ 5,000	$ 5,600