Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 64,712	$ 77,624	$ 164,609	$ 172,043
Other comprehensive income (loss), net of tax effects:
Foreign currency translation adjustments	951	(6,449)	2,858	(19,867)
Changes in unrealized holding gains or losses on available-for-sale securities, net of reclassification adjustment for realized gains and losses	122	1	682	13
Changes in defined benefit plan liabilities	(238)	240	(265)	558
Total other comprehensive income (loss), net of tax effects	835	(6,208)	3,275	(19,296)
Comprehensive income	$ 65,547	$ 71,416	$ 167,884	$ 152,747