Fair Value Measurements (Summary Of Assets And Liabilities Measured at Fair Value) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 29, 2013	Dec. 31, 2012	Sep. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	$ 122,234	$ 135,634	$ 136,376
Fair Value, Measurements, Recurring [Member] | Balance [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	832,344	852,979	1,417,900
Marketable securities	122,234	135,634	136,376
Derivative Asset, Current	1,733	317	1,639
Total assets measured at fair value	956,311	988,930	1,555,915
Derivatives, liabilities	1,152	7,920	2,458
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	506,792	690,691	1,161,646
Marketable securities	0	0	0
Derivative Asset, Current	0	0	0
Total assets measured at fair value	506,792	690,691	1,161,646
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	325,552	162,288	256,254
Marketable securities	122,234	135,634	136,376
Derivative Asset, Current	1,733	317	1,639
Total assets measured at fair value	449,519	298,239	394,269
Derivatives, liabilities	1,152	7,920	2,458
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
Marketable securities	0	0	0
Derivative Asset, Current	0	0	0
Total assets measured at fair value	0	0	0
Derivatives, liabilities	$ 0	$ 0	$ 0