Earnings per Share - Basic Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2019
Basic Earnings per Share from Continuing Operations
Income from continuing operations	$ 1,110,968	$ 876,360	$ 882,635
Less: income from continuing operations allocated to participating securities	7,623	8,158	9,568
Income from continuing operations available to common shareholders	$ 1,103,345	$ 868,202	$ 873,067
Basic weighted average common shares outstanding (shares)	104,874	103,816	106,080
Basic earnings per share from continuing operations (dollars per share)	$ 10.52	$ 8.36	$ 8.23