CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	Nov. 30, 2019	Aug. 31, 2019
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 8,348	$ 8,403
Common stock, par value (in USD per share)	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares outstanding	118,649,865	117,924,938
Treasury stock, shares	10,410,799	11,135,726