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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
May 31, 2016
May 31, 2015
Statement Of Financial Position [Abstract]    
Trade accounts receivable, allowances $ 24,600 $ 24,526
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, authorized 50,000,000 50,000,000
Preferred stock, issued 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, authorized 300,000,000 300,000,000
Common stock, issued 140,195,000 138,828,000
Common stock, outstanding 132,944,000 133,203,000