Unaudited Condensed Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Feb. 28, 2022	Feb. 28, 2021	Feb. 28, 2022	Feb. 28, 2021
Statement of Stockholders' Equity [Abstract]
Dividends declared per common share (in dollars per share)	$ 0.305	$ 0.275	$ 0.885	$ 0.795
Dividends declared per preferred share (in dollars per share)			$ 0.10	$ 0.10