Earnings Per Share - Reconciliation of Basic and Diluted EPS Calculations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Earnings Per Share [Abstract]
Net income	$ 3,920	$ 1,192	$ 10,257	$ 17,429	$ (18,440)	$ 5,171	$ 12,467	$ 24,455	$ 32,798	$ 23,653	$ 43,138
Weighted average shares outstanding for basic EPS	79,271	78,474	78,318	78,205	77,526	76,118	75,249	74,714	78,608	75,899	59,895
Effect of dilutive securities:
Stock options									3,019	3,129	2,140
Restricted Stock									56	13	0
Weighted average shares outstanding for diluted EPS	81,785	81,561	81,424	81,466	77,526	79,710	77,858	77,837	81,683	79,041	62,035
Basic EPS (in usd per share)	$ 0.05	$ 0.02	$ 0.13	$ 0.22	$ (0.24)	$ 0.07	$ 0.17	$ 0.33	$ 0.42	$ 0.31	$ 0.72
Diluted EPS (in usd per share)	$ 0.05	$ 0.01	$ 0.13	$ 0.21	$ (0.24)	$ 0.06	$ 0.16	$ 0.31	$ 0.40	$ 0.30	$ 0.70
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive options, RSUs outstanding excluded from EPS	350	315	391	356	3,130	0	0	0
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive options, RSUs outstanding excluded from EPS									294	0	254