Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 25, 2019	Sep. 25, 2019	Jun. 26, 2019	Mar. 27, 2019	Dec. 26, 2018	Sep. 26, 2018	Jun. 27, 2018	Mar. 28, 2018	Dec. 25, 2019	Dec. 26, 2018	Dec. 27, 2017
Earnings Per Share [Abstract]
Net income	$ 18,559	$ 49,122	$ 34,239	$ 15,490	$ 11,503	$ 10,805	$ 11,626	$ 9,759	$ 117,410	$ 43,693	$ 39,594
Weighted average shares outstanding - basic									59,944	63,364	68,077
Effect of dilutive share-based compensation awards									1,889	2,198	2,326
Weighted average shares outstanding - diluted									61,833	65,562	70,403
Basic net income per share (in dollars per share)	$ 0.32	$ 0.83	$ 0.57	$ 0.25	$ 0.19	$ 0.17	$ 0.18	$ 0.15	$ 1.96	$ 0.69	$ 0.58
Diluted net income per share (in dollars per share)	$ 0.31	$ 0.80	$ 0.55	$ 0.24	$ 0.18	$ 0.16	$ 0.18	$ 0.15	$ 1.90	$ 0.67	$ 0.56
Anti-dilutive share-based compensation awards (in shares)									270	0	606