CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Aug. 31, 2018	Aug. 31, 2017
Treasury stock, shares	20,439,434	20,439,434
Common stock, par value	$ 0.20	$ 0.20
Common stock, shares authorized	168,000,000	168,000,000
Common stock, shares issued	81,423,584	80,200,110
Common Class A
Common stock, par value	$ 0.2
Common stock, shares authorized	168,000,000
Common stock, shares issued	81,423,584