Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 29, 2018
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts	$ 984	$ 983
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	32,787,553	33,004,861
Common stock, shares outstanding	32,787,553	33,004,861