Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jul. 31, 2020	Jan. 31, 2020
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts receivable	$ 904	$ 947
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	37,727,987	37,303,952
Common stock, shares outstanding	37,556,067	37,163,462
Treasury stock, common shares	171,920	140,490