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	3 Months Ended	12 Months Ended
	Feb. 28, 2019	May 31, 2020	May 31, 2019	May 31, 2018
Income Tax Disclosure [Abstract]
Income tax expense at the U.S. statutory federal income tax rate		$ 85,630	$ 71,367	$ 121,812
Impact of foreign operations		3,433	(1,571)	(16,276)
State and local income taxes, net		11,651	7,224	9,520
Impact of GILTI provisions		3,051	5,772
Domestic manufacturing deduction				(4,839)
Nondeductible business expense		2,005	2,259	2,473
Valuation allowance		14,008	7,021	(5,235)
Deferred tax liability for unremitted foreign earnings		(5,527)		(77,970)
Changes in unrecognized tax benefits		1,292	(8,480)
Other		(3,351)	1,195	737
FY19 GILTI impact of issued regulations		(4,348)
Equity-based compensation		(5,162)	(4,496)	(4,652)
Transition tax liability	$ 1,800		(1,868)	67,899
Remeasurement of U.S. deferred income taxes			(6,265)	(15,678)
Provision for Income Taxes		$ 102,682	$ 72,158	$ 77,791
Effective Income Tax Rate		25.20%	21.20%	18.70%