Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Feb. 28, 2021	Aug. 31, 2020
Statement Of Financial Position [Abstract]
Preferred stock, without par value
Preferred stock, shares authorized	25,000,000	25,000,000
Preferred stock, outstanding	0	0
Common stock, without par value
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares outstanding	32,825,000	32,701,000