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CONSOLIDATED CONDENSED BALANCE SHEETS (Parenthetical)
Feb. 29, 2012
May 31, 2011
CONSOLIDATED CONDENSED BALANCE SHEETS    
Preferred stock, shares authorized 100,000 100,000
Preferred stock, shares outstanding 0 0
Common stock, shares authorized 425,000,000 425,000,000
Common stock, shares issued 173,652,551 173,346,180
Common stock, shares outstanding 129,742,251 137,583,884
Treasury stock, shares 43,910,300 35,762,296