Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Apr. 03, 2020	Jan. 03, 2020
Statement Of Financial Position [Abstract]
Accounts receivable, net of allowance for contract losses and doubtful accounts	$ 6,192	$ 4,295
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	120,000,000	120,000,000
Common stock, shares issued	65,707,000	65,707,000
Treasury stock, shares	14,161,000	13,951,000