Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Feb. 29, 2020	Aug. 31, 2019
Statement Of Financial Position [Abstract]
Preferred stock, without par value	$ 0	$ 0
Preferred stock, shares authorized	25,000,000	25,000,000
Preferred stock, outstanding	0	0
Common stock, without par value	$ 0	$ 0
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares outstanding	32,642,000	32,488,000