Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2016	Apr. 05, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 14,885	$ 20,502
Cash flow hedges:
Net unrealized gain (loss), net of tax of ($82) and ($73) in 2016 and 2015, respectively	(585)	(520)
Reclassification of net realized (gain) loss into current operations	4	110
Net change related to cash flow hedges	(581)	(410)
Available-for-sale investments:
Net unrealized gain (loss), net of tax of $267 and $134 in 2016 and 2015, respectively	1,281	899
Reclassification of net realized (gain) loss into current operations	13	(29)
Net change related to available-for-sale investments	1,294	870
Foreign currency translation adjustments:
Foreign currency translation adjustments, net of tax of $329 and ($636) in 2016 and 2015, respectively	5,160	(10,690)
Other comprehensive income (loss), net of tax	5,873	(10,230)
Total comprehensive income	$ 20,758	$ 10,272