Marketable Securities Composition (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 02, 2016	Jan. 03, 2015
Schedule of Available-for-sale Securities [Line Items]
Term of maturities of investments considered short-term	2 years
Short-term marketable securities	$ 17,968	$ 139,233
Short-term marketable securities
Schedule of Available-for-sale Securities [Line Items]
Short-term marketable securities	17,968	139,233
Short-term marketable securities | Corporate and government bonds and notes and commercial paper
Schedule of Available-for-sale Securities [Line Items]
Maturing within one year	12,144	60,965
Maturing between one and two years	5,824	78,268
Short-term marketable securities	17,888	139,233
Short-term marketable securities | Certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Short-term marketable securities	$ 80	$ 0