CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 41,606	$ 23,542
Other comprehensive income (loss):
Unrealized gains on hedging transactions, net of income taxes	613	1,743
Unrealized holding gains (losses) on investments, net of income taxes	148	(72)
Foreign currency translation adjustment	(167)	94
Comprehensive income	$ 42,200	$ 25,307