Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	May 31, 2022	May 31, 2021	May 31, 2020
Statement of Stockholders' Equity [Abstract]
Dividends declared per common share (in dollars per share)	$ 1.190	$ 1.070	$ 0.955
Dividends declared per preferred share (in dollars per share)	$ 0.10	$ 0.10	$ 0.10