Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Feb. 28, 2023	May 31, 2022
Statement of Financial Position [Abstract]
Accounts receivable, allowances	$ 2,030	$ 1,939
Preferred stock, par value (in usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	75,000,000	75,000,000
Common stock, shares issued (in shares)	39,976,422	39,541,173
Common stock, shares outstanding (in shares)	39,606,422	39,171,173
Treasury stock, shares (in shares)	370,000	370,000