Fair Value Measurements (Summary of Assets And Liabilities Measured at Fair Value) (Detail) - USD ($) $ in Thousands	Jun. 26, 2016	Dec. 31, 2015	Jun. 28, 2015
Fair Value
Assets:
Cash equivalents	$ 864,670	$ 722,209	$ 1,247,579
Marketable securities	42,721	81,448	90,214
Derivatives	9,528	16,235	26,501
Liabilities:
Derivatives, liabilities	1,605	1,300	986
Fair Value, Measurements, Recurring
Assets:
Cash equivalents	549,426	555,910	1,030,928
Marketable securities	42,721	81,448	90,214
Derivatives	9,528	16,235	26,501
Assets, fair value	601,675	653,593	1,147,643
Liabilities:
Derivatives, liabilities	1,605	1,300	986
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash equivalents	392,800	390,706	558,660
Marketable securities	37,651	36,256	37,698
Derivatives	0	0	0
Assets, fair value	430,451	426,962	596,358
Liabilities:
Derivatives, liabilities	0	0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Cash equivalents	156,626	165,204	472,268
Marketable securities	5,070	45,192	52,516
Derivatives	9,528	16,235	26,501
Assets, fair value	171,224	226,631	551,285
Liabilities:
Derivatives, liabilities	1,605	1,300	986
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	0	0	0
Marketable securities	0	0	0
Derivatives	0	0	0
Assets, fair value	0	0	0
Liabilities:
Derivatives, liabilities	0	0	0
Fair Value, Measurements, Nonrecurring | Fair Value Adjustment
Liabilities:
Repossessed inventory	3,600	8,600	1,900
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Fair Value
Liabilities:
Repossessed inventory	$ 15,300	$ 17,700	$ 13,100