Fair Value of Financial Instruments - Assets in Level 3 (Details) - Assets and liabilities measured at fair value on recurring basis - Significant Unobservable Inputs (Level 3) - USD ($) $ in Thousands	12 Months Ended
	Jan. 02, 2016	Jan. 03, 2015
Fair value assets reconciliation of changes
Balance at the end of the period	$ 7,126
Auction rate securities
Fair value assets reconciliation of changes
Balance at the beginning of the period	7,419	$ 10,632
Settlements		(4,425)
Gain (loss) included in other comprehensive income (loss)	(293)	1,212
Balance at the end of the period	$ 7,126	$ 7,419