Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 26, 2020	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Numerator:
Net income as reported	$ 58,977	$ 55,356	$ (8,991)	$ 24,644	$ 22,654	$ 35,647	$ 43,792	$ 36,989	$ 129,986	$ 139,082	$ 164,565
Weighted average shares outstanding
Basic (in shares)									24,371	24,576	24,870
Effect of dilutive securities (in shares)									221	242	365
Diluted (in shares)									24,592	24,818	25,235
Earnings Per Share:
Basic earnings per share (in dollars per share)	$ 2.41	$ 2.27	$ (0.37)	$ 1.01	$ 0.93	$ 1.46	$ 1.77	$ 1.50	$ 5.33	$ 5.66	$ 6.62
Diluted earnings per share (in dollars per share)	$ 2.39	$ 2.25	$ (0.37)	$ 1.00	$ 0.92	$ 1.44	$ 1.75	$ 1.48	$ 5.29	$ 5.60	$ 6.52