Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 58,160	$ 23,263	$ 94,419	$ 56,333
Other comprehensive income (loss), net of tax effects:
Foreign currency translation adjustments	(4,528)	2,377	(13,418)	6,828
Changes in unrealized holding gains or losses on available-for-sale securities, net of reclassification adjustment for realized gains and losses	(52)	775	13	595
Changes in defined benefit plan liabilities	26	(21)	317	387
Total other comprehensive income (loss), net of tax effects	(4,554)	3,131	(13,088)	7,810
Comprehensive income	$ 53,606	$ 26,394	$ 81,331	$ 64,143