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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
May 31, 2018
May 31, 2017
Statement of Financial Position [Abstract]    
Accounts receivable, allowances $ 2,466 $ 2,945
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) 37,594,493 37,210,091
Common stock, shares outstanding (shares) 37,224,493 36,840,091
Treasury stock, shares (shares) 370,000 370,000