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
	Dec. 31, 2016	Jan. 02, 2016
Fair value assets reconciliation of changes
Balance at the end of the year	$ 5,196
Auction rate securities
Fair value assets reconciliation of changes
Balance at the beginning of the year	7,126	$ 7,419
Settlements	(2,000)
Gain (loss) included in other comprehensive income (loss)	70	(293)
Balance at the end of the year	$ 5,196	$ 7,126