Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Feb. 28, 2021	Nov. 30, 2020	Aug. 31, 2020	Feb. 29, 2020	Nov. 30, 2019	Aug. 31, 2019
Statement Of Stockholders Equity [Abstract]
Dividends declared and paid per share	$ 0.38	$ 0.38	$ 0.36	$ 0.36	$ 0.36	$ 0.35