Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 37,535	$ 38,500	$ 93,868	$ 126,538
Other comprehensive income (loss), net of tax effects:
Foreign currency translation adjustments	(6,428)	(5,442)	400	(23,308)
Changes in unrealized holding gains or losses on available-for-sale securities, net of reclassification adjustment for realized gains and losses	(400)	177	195	(206)
Changes in defined benefit plan liabilities	51	66	438	448
Total other comprehensive income (loss), net of tax effects	(6,777)	(5,199)	1,033	(23,066)
Comprehensive income	$ 30,758	$ 33,301	$ 94,901	$ 103,472