Earnings Per Share - Schedule of Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Aug. 31, 2025	Aug. 31, 2024
Basic Earnings per Share
Amortization of interest rate locks, net of tax	$ 491,140	$ 452,033
Less: net income allocated to participating securities	1,651	1,654
Net income available to common shareholders	$ 489,489	$ 450,379
Basic weighted average common shares outstanding (in shares)	403,292	403,382
Basic earnings per share (in dollars per share)	$ 1.21	$ 1.12
Diluted Earnings per Share
Amortization of interest rate locks, net of tax	$ 491,140	$ 452,033
Less: net income allocated to participating securities	1,651	1,654
Net income available to common shareholders	$ 489,489	$ 450,379
Basic weighted average common shares outstanding (in shares)	403,292	403,382
Effect of dilutive securities - employee stock options (in shares)	6,002	7,114
Diluted weighted average common shares outstanding (in shares)	409,294	410,496
Diluted earnings per share (in dollars per share)	$ 1.20	$ 1.10