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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
May 31, 2014
May 31, 2013
Statement of Financial Position [Abstract]    
Accounts receivable, allowances $ 1,736 $ 1,272
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 5,000,000 5,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.01 $ 0.01
Shares of common stock 45,000,000 45,000,000
Common stock, shares issued 35,442,004 35,442,004
Common stock, shares outstanding 35,060,351 35,060,351
Treasury stock, shares 142,305 142,305