Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014
Net income	$ 48,974	$ 50,490	$ 89,308	$ 84,714
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation adjustments	12,271	2,706	(11,426)	3,340
Unrealized (losses) gains on securities, net of tax	(34)	2	(63)	(30)
Other comprehensive income (loss)	12,237	2,708	(11,489)	3,310
Comprehensive income	$ 61,211	$ 53,198	$ 77,819	$ 88,024