Marketable Securities Composition (Details) - Short-term marketable securities - USD ($) $ in Thousands	Apr. 02, 2016	Jan. 02, 2016
Schedule of Available-for-sale Securities [Line Items]
Maturing within one year	$ 11,855	$ 12,144
Maturing between one and two years	0	5,824
Total marketable securities	11,855	17,968
Corporate and government bonds and notes, and commercial paper
Schedule of Available-for-sale Securities [Line Items]
Total marketable securities	11,775	17,888
Certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Total marketable securities	$ 80	$ 80