Income Taxes - Components of Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2019
Income tax expense for continuing operations consists of the following components:
Federal	$ 164,104	$ 153,736	$ 134,174
State and local	42,340	34,502	40,949
Foreign	12,417	6,985	9,882
Current income tax expense	218,861	195,223	185,005
Deferred	(42,080)	(13,292)	34,759
Income taxes	$ 176,781	$ 181,931	$ 219,764