Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	May 31, 2023	May 31, 2022
Statement of Financial Position [Abstract]
Accounts receivable, allowances	$ 2,150	$ 1,939
Preferred stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (shares)	5,000,000	5,000,000
Preferred stock, shares issued (shares)	0	0
Preferred stock, shares outstanding (shares)	0	0
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (shares)	75,000,000	75,000,000
Common stock, shares issued (shares)	39,981,422	39,541,173
Common stock, shares outstanding (shares)	39,611,422	39,171,173
Treasury stock, shares (shares)	370,000,000	370,000,000