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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Nov. 30, 2021
May 31, 2021
Statement of Financial Position [Abstract]    
Accounts receivable, allowances $ 1,850 $ 1,919
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) 39,455,193 38,920,951
Common stock, shares outstanding (in shares) 39,085,193 38,550,951
Treasury stock, shares (in shares) 370,000 370,000