Consolidated Balance Sheets (Parenthetical) - $ / shares	May 31, 2021	Aug. 31, 2020
Statement Of Financial Position [Abstract]
Common stock, shares issued	134,217,410	133,269,301
Common stock, shares outstanding	131,660,379	130,713,745
Common stock, shares authorized	300,000,000	300,000,000
Common stock, par value	$ 0.01	$ 0.01
Preferred stock, shares outstanding	0	0
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, par value	$ 0.01	$ 0.01
Treasury stock, common shares	2,557,031	2,555,556