Income Taxes - Reconciliation of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2023	May 31, 2022	May 31, 2021
Reconciliation of income tax expense for continuing operations using the statutory rate and actual income tax expense is as follows:
Income taxes at the U.S. federal statutory rate	$ 355,561	$ 314,741	$ 270,427
Permanent differences	(59,502)	(85,413)	(101,870)
State and local income taxes, net of federal benefit	46,245	33,547	27,304
Capital loss carryback	0	0	(14,072)
Other	2,834	136	(5,008)
Income taxes	$ 345,138	$ 263,011	$ 176,781