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Reconciliation of Income Taxes Computed at the U.S. Federal Statutory Tax Rate to Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2019	May 31, 2018	May 31, 2017
Components Of Deferred Income Tax Assets And Liabilities [Line Items]
Tax at U.S. statutory rate	$ 15,321	$ 21,459	$ 23,336
Section 199 domestic production deduction		(1,167)	(1,057)
Global intangible low-taxed income (GILTI)	840
Foreign derived intangible income deduction (FDII)	(1,531)
Foreign rate differential	495	(461)	(1,247)
Subpart F income	842	816	996
Tax benefits on stock-based compensation	(2,586)	(4,816)	(535)
FIN 48 reserve adjustments	13	(1,035)	576
Provision for state income taxes, net of federal benefit	1,251	975	972
Remeasurement of deferred taxes		(6,022)
Transition tax on foreign earnings and profits		1,223
Tax credits	(1,726)	(1,151)	(1,213)
Other	(136)	429	872
Provision for Income Taxes	$ 12,783	$ 10,250	$ 22,700

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