Income Taxes - Components of Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2019	May 31, 2018	May 31, 2017
Current
Federal	$ 15,454	$ 33,261	$ 50,200
State and local	2,309	3,292	2,954
Foreign	7,985	9,904	7,593
Current Income Tax Expense (Benefit), Total	25,748	46,457	60,747
Deferred
Federal	18,195	(34,442)	18,177
State and local	1,621	388	476
Foreign	(2,381)	(4,183)	(210)
Provision for (benefit from) deferred income taxes	17,435	(38,237)	18,443
Income tax expense	$ 43,183	$ 8,220	$ 79,190