Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 102,348	$ 53,675	$ 204,075	$ 111,319
Cash flow hedges:
Net unrealized gain (loss), net of tax of ($8) and $21 in the three-month periods and net of tax of ($5) and ($76) in the nine-month periods, respectively	(4)	(86)	(16)	(965)
Reclassification of net realized (gain) loss into current operations	(56)	241	(21)	427
Net change related to cash flow hedges	(60)	155	(37)	(538)
Available-for-sale investments:
Net unrealized gain (loss), net of tax of $41 and ($29) in the three-month periods and net of tax of $191 and $481 in the nine-month periods, respectively	419	40	1,237	2,672
Reclassification of net realized (gain) loss into current operations	(263)	(55)	(370)	(183)
Net change related to available-for-sale investments	156	(15)	867	2,489
Foreign currency translation adjustments:
Foreign currency translation adjustments, net of tax of $0 and $80 in the three-month periods and net of tax of $0 and $254 in the nine-month periods, respectively	5,753	1,125	18,497	3,739
Other comprehensive income (loss), net of tax	5,849	1,265	19,327	5,690
Total comprehensive income	$ 108,197	$ 54,940	$ 223,402	$ 117,009