Earnings Per Share - Schedule of Computation of EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 29, 2024	Feb. 28, 2023	Feb. 29, 2024	Feb. 28, 2023
Basic earnings per share:
Net income	$ 397,579	$ 325,827	$ 1,157,277	$ 1,001,809
Less: net income allocated to participating securities	1,543	1,351	4,486	4,155
Net income available to common shareholders	$ 396,036	$ 324,476	$ 1,152,791	$ 997,654
Basic weighted average common shares outstanding (in shares)	101,477	101,714	101,681	101,589
Basic earnings per share (in dollars per share)	$ 3.90	$ 3.19	$ 11.34	$ 9.82
Diluted earnings per share:
Net income	$ 397,579	$ 325,827	$ 1,157,277	$ 1,001,809
Less: net income allocated to participating securities	1,543	1,351	4,486	4,155
Net income available to common shareholders	$ 396,036	$ 324,476	$ 1,152,791	$ 997,654
Basic weighted average common shares outstanding (in shares)	101,477	101,714	101,681	101,589
Effect of dilutive securities - employee stock options (in shares)	1,710	1,704	1,666	1,774
Diluted weighted average common shares outstanding (in shares)	103,187	103,418	103,347	103,363
Diluted earnings per share (in dollars per share)	$ 3.84	$ 3.14	$ 11.15	$ 9.65