Earnings per Share - Computation of EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	May 31, 2022	May 31, 2021	May 31, 2020
Basic Earnings per Share from Continuing Operations
Income from continuing operations	$ 1,235,757	$ 1,110,968	$ 876,360
Less: income from continuing operations allocated to participating securities	6,132	7,623	8,158
Income from continuing operations available to common shareholders	$ 1,229,625	$ 1,103,345	$ 868,202
Basic weighted average common shares outstanding (in shares)	103,172	104,874	103,816
Basic earnings per share from continuing operations (in dollars per share)	$ 11.92	$ 10.52	$ 8.36
Diluted Earnings per Share from Continuing Operations
Income from continuing operations	$ 1,235,757	$ 1,110,968	$ 876,360
Less: income from continuing operations allocated to participating securities	6,132	7,623	8,158
Income from continuing operations available to common shareholders	$ 1,229,625	$ 1,103,345	$ 868,202
Basic weighted average common shares outstanding (in shares)	103,172	104,874	103,816
Effect of dilutive securities - employee stock options (in shares)	2,351	2,833	3,196
Diluted weighted average common shares outstanding (in shares)	105,523	107,707	107,012
Diluted earnings per share from continuing operations (in dollars per share)	$ 11.65	$ 10.24	$ 8.11