Fair Value Measurements (Summary of Assets And Liabilities Measured at Fair Value) (Detail) - USD ($) $ in Thousands	Mar. 26, 2017	Dec. 31, 2016	Mar. 27, 2016
Fair Value
Assets:
Cash equivalents	$ 839,700	$ 759,984	$ 694,013
Marketable securities	46,678	43,638	83,689
Derivatives	12,446	29,034	3,651
Liabilities:
Derivatives, liabilities	1,052	142	3,176
Fair Value, Measurements, Recurring
Assets:
Cash equivalents	628,895	531,519	531,823
Marketable securities	46,678	43,638	83,689
Derivatives	12,446	29,034	3,651
Assets, fair value	688,019	604,191	619,163
Liabilities:
Derivatives, liabilities	1,052	142	3,176
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash equivalents	370,084	426,266	426,700
Marketable securities	41,674	38,119	38,567
Derivatives	0	0	0
Assets, fair value	411,758	464,385	465,267
Liabilities:
Derivatives, liabilities	0	0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Cash equivalents	258,811	105,253	105,123
Marketable securities	5,004	5,519	45,122
Derivatives	12,446	29,034	3,651
Assets, fair value	276,261	139,806	153,896
Liabilities:
Derivatives, liabilities	1,052	142	3,176
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	6,300	9,300	6,500
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Fair Value
Liabilities:
Repossessed inventory	$ 20,100	$ 19,300	$ 18,600