Unaudited Condensed Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2021	Nov. 30, 2020
Statement of Stockholders' Equity [Abstract]
Dividends declared per common share (in dollars per share)	$ 0.305	$ 0.275	$ 0.580	$ 0.520
Dividends declared per preferred share (in dollars per share)			$ 0.10	$ 0.10