Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended		9 Months Ended
	Aug. 31, 2019	Aug. 31, 2018	Nov. 30, 2019	Nov. 30, 2018	Feb. 29, 2020	Feb. 28, 2019
Statement Of Stockholders Equity [Abstract]
Dividends declared and paid per share	$ 0.35	$ 0.32	$ 0.36	$ 0.35	$ 0.36	$ 0.35