Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Oct. 04, 2015	Oct. 02, 2016	Oct. 04, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 53,675	$ 104,112	$ 111,319	$ 168,328
Cash flow hedges:
Net unrealized gain (loss), net of tax of $21 and ($3) in the three-month periods and net of tax of ($76) and ($28) in the nine-month periods, respectively	(86)	(140)	(965)	(423)
Reclassification of net realized (gain) loss into current operations	241	90	427	269
Net change related to cash flow hedges	155	(50)	(538)	(154)
Available-for-sale investments:
Net unrealized gain (loss), net of tax of ($29) and ($61) in the three-month periods and net of tax of $481 and ($55) in the nine-month periods, respectively	40	(666)	2,672	(100)
Reclassification of net realized (gain) loss into current operations	(55)	(19)	(183)	(240)
Net change related to available-for-sale investments	(15)	(685)	2,489	(340)
Foreign currency translation adjustments:
Foreign currency translation adjustments, net of tax of $80 and $4 in the three-month periods and net of tax of $254 and ($525) in the nine-month periods, respectively	1,125	620	3,739	(7,620)
Other comprehensive income (loss), net of tax	1,265	(115)	5,690	(8,114)
Total comprehensive income	$ 54,940	$ 103,997	$ 117,009	$ 160,214