Fair Value Measurements (Summary Of Assets And Liabilities Measured at Fair Value) (Detail) - USD ($) $ in Thousands	Jun. 28, 2015	Dec. 31, 2014	Jun. 29, 2014
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Repossessed Assets	$ 13,100	$ 13,400	$ 11,200
Fair Value, Measurements, Recurring [Member] | Balance [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1,030,928	737,024	660,520
Investments, Fair Value Disclosure	90,214	91,140	91,381
Derivative Asset, Current	26,501	32,244	3,159
Assets, Fair Value Disclosure	1,147,643	860,408	755,060
Derivatives, liabilities	986	2,027	1,478
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	558,660	482,686	482,780
Investments, Fair Value Disclosure	37,698	33,815	33,567
Derivative Asset, Current	0	0	0
Assets, Fair Value Disclosure	596,358	516,501	516,347
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	472,268	254,338	177,740
Investments, Fair Value Disclosure	52,516	57,325	57,814
Derivative Asset, Current	26,501	32,244	3,159
Assets, Fair Value Disclosure	551,285	343,907	238,713
Derivatives, liabilities	986	2,027	1,478
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	$ 1,900	$ 5,000	$ 2,400