CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	May 31, 2020	Aug. 31, 2019
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 8,661	$ 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	119,065,133	117,924,938
Treasury stock, shares	9,995,531	11,135,726