Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2015	Sep. 27, 2014	Oct. 03, 2015	Sep. 27, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 77,624	$ 37,535	$ 172,043	$ 93,868
Other comprehensive income (loss), net of tax effects:
Foreign currency translation adjustments	(6,449)	(6,428)	(19,867)	400
Changes in unrealized holding gains or losses on available-for-sale securities, net of reclassification adjustment for realized gains and losses	1	(400)	13	195
Changes in defined benefit plan liabilities	240	51	558	438
Total other comprehensive income (loss), net of tax effects	(6,208)	(6,777)	(19,296)	1,033
Comprehensive income	$ 71,416	$ 30,758	$ 152,747	$ 94,901