Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 27, 2017		Sep. 27, 2017		Jun. 28, 2017		Mar. 29, 2017		Dec. 28, 2016		Sep. 28, 2016		Jun. 29, 2016		Mar. 30, 2016		Dec. 27, 2017	Dec. 28, 2016	Dec. 30, 2015
Earnings Per Share [Abstract]
Net income	$ 13,147		$ 9,325		$ 8,749		$ 8,373		$ 11,274		$ 9,726		$ (11,552)		$ 9,954		$ 39,594	$ 19,402	$ 35,976
Weighted average shares outstanding - basic (in shares)																	68,077	75,325	82,627
Effect of dilutive share-based compensation awards																	2,326	1,881	2,102
Weighted average shares outstanding - diluted (in shares)																	70,403	77,206	84,729
Basic net income per share	$ 0.20	[1]	$ 0.14	[1]	$ 0.13	[1]	$ 0.12	[1]	$ 0.16	[2]	$ 0.13	[2]	$ (0.15)	[2]	$ 0.13	[2]	$ 0.58	$ 0.26	$ 0.44
Diluted net income per share	$ 0.19	[1]	$ 0.13	[1]	$ 0.12	[1]	$ 0.11	[1]	$ 0.15	[2]	$ 0.13	[2]	$ (0.15)	[2]	$ 0.13	[2]	$ 0.56	$ 0.25	$ 0.42
Anti-dilutive share-based compensation awards (in shares)																	606	0	0

[1] Per share amounts do not necessarily sum to the total year amounts due to changes in shares outstanding and rounding

[2] Per share amounts do not necessarily sum to the total year amounts due to changes in shares outstanding and rounding.