Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	May. 31, 2015	Aug. 31, 2014
Condensed Consolidated Balance Sheets [Abstract]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	245,000,000	245,000,000
Common stock, shares issued	118,309,000	118,309,000
Treasury stock, shares	66,231,000	64,505,000