CONSOLIDATED CONDENSED BALANCE SHEETS (Parenthetical)	Aug. 31, 2011	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	173,631,015	173,346,180
Common stock, shares outstanding	129,722,089	137,583,884
Treasury stock, shares	43,908,926	35,762,296