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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Feb. 28, 2021
May 31, 2020
Statement of Financial Position [Abstract]    
Accounts receivable, allowances $ 1,820 $ 2,150
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) 38,877,367 38,448,536
Common stock, shares outstanding (in shares) 38,507,367 38,078,536
Treasury stock, shares (in shares) 370,000 370,000