Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2016	Apr. 04, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 12,969	$ 28,799
Other comprehensive income – unrealized gain on available-for-sale marketable debt securities, net of income tax	14	72
Comprehensive income	$ 12,983	$ 28,871