Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 33,070	$ 78,609
Other comprehensive income (loss), net of tax effects:
Foreign currency translation adjustments	4,452	(6,162)
Changes in unrealized holding gains or losses on available-for-sale securities, net of reclassification adjustment for realized gains and losses	(181)	(284)
Changes in defined benefit plan liabilities	408	318
Total other comprehensive income (loss), net of tax effects	4,679	(6,128)
Comprehensive income	$ 37,749	$ 72,481