Net (Loss) Income per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Jan. 02, 2016	Oct. 03, 2015	Jul. 04, 2015	Apr. 04, 2015	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net (loss) income	$ (8,164)	$ (12,414)	$ (13,810)	$ (19,711)	$ (45,454)	$ (24,862)	$ (35,570)	$ (53,347)	$ (54,099)	$ (159,233)	$ 48,580
Shares used in basic Net (loss) income per share									119,994	117,387	117,708
Dilutive effect of stock options, RSUs and ESPP shares									0	0	2,537
Shares used in diluted Net (loss) income per share									119,994	117,387	120,245
Basic Net (loss) income per share									$ (0.45)	$ (1.36)	$ 0.41
Diluted Net (loss) income per share									$ (0.45)	$ (1.36)	$ 0.40
Stock options, RSU's and ESPP shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Aggregate antidilutive shares excluded from computation of diluted net (loss) income per share									9,000	9,200	2,600