Income Taxes - Reconciliation of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2022	May 31, 2021	May 31, 2020
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	$ 314,741	$ 270,427	$ 222,258
Permanent differences	(85,413)	(101,870)	(67,075)
State and local income taxes, net of federal benefit	33,547	27,304	25,294
Capital loss carryback	0	(14,072)	0
Other	136	(5,008)	1,454
Income taxes	$ 263,011	$ 176,781	$ 181,931