Marketable Securities Composition (Details) - Short-term marketable securities - USD ($) $ in Thousands	Oct. 03, 2015	Jan. 03, 2015
Schedule of Available-for-sale Securities [Line Items]
Maturing within one year	$ 3,077	$ 60,965
Maturing between one and two years	3,013	78,268
Total marketable securities	6,090	139,233
Corporate and Government Bonds and Notes and Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Total marketable securities	6,015	139,233
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Total marketable securities	$ 75	$ 0