Reconciliation of Income Tax Expense (Benefit) Computed by Applying U.S. Statutory Federal Income Tax Rate against Income (Loss) before Income Taxes to Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2019
Income Tax Disclosure [Abstract]
Income tax expense at the U.S. statutory federal income tax rate	$ 140,372	$ 85,630	$ 71,367
Foreign rate differential and other foreign tax adjustments	11,942	3,433	(1,571)
State and local income taxes, net	18,625	11,651	7,224
Impact of GILTI provisions	1,598	3,051	5,772
Nondeductible business expense	616	2,005	2,259
Valuation allowance	(4,389)	14,008	7,021
Deferred tax liability for unremitted foreign earnings	5,348	(5,527)
Changes in unrecognized tax benefits	(1,847)	1,292	(8,480)
Other	1,324	(3,351)	1,195
FY19 GILTI impact of issued regulations		(4,348)
Equity-based compensation	(8,651)	(5,162)	(4,496)
Transition tax liability			(1,868)
Remeasurement of U.S. deferred income taxes			(6,265)
Provision for Income Taxes	$ 164,938	$ 102,682	$ 72,158
Effective Income Tax Rate	24.70%	25.20%	21.20%