CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Aug. 31, 2015	Aug. 31, 2014
Statement of Financial Position [Abstract]
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued
Preferred stock, shares outstanding
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	246,680,008	243,930,983
Common stock, shares outstanding	192,068,068	194,113,850
Treasury stock, shares	54,611,940	49,817,133