Earnings per Share - Unaudited Proforma EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	May 31, 2024	May 31, 2023	May 31, 2022
Earnings Per Share [Abstract]
Net income allocated to common shareholders, as reported	$ 1,565,664	$ 1,342,547	$ 1,229,625
Proforma basic weighted average common shares outstanding (in shares)	406,612	406,580	412,688
Proforma effect of dilutive securities - employee stock options (in shares)	6,856	6,928	9,404
Proforma diluted weighted average common shares outstanding (in shares)	413,468	413,508	422,092
Proforma basic earnings per share (in dollars per share)	$ 3.85	$ 3.30	$ 2.98
Proforma diluted earnings per share (in dollars per share)	$ 3.79	$ 3.25	$ 2.91