CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Aug. 31, 2017	Aug. 31, 2016
Treasury stock, shares	20,439,434	20,439,434
Common stock, par value	$ 0.20
Common stock, shares authorized	168,000,000
Common stock, shares issued	80,200,110	79,393,393
Common Class A
Common stock, par value	$ 0.2
Common stock, shares authorized	168,000,000
Common stock, shares issued	80,200,110