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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, 2020	May 31, 2019	May 31, 2018
Components Of Deferred Income Tax Assets And Liabilities [Line Items]
Tax at U.S. statutory rate	$ 15,184	$ 15,321	$ 21,459
Permanent differences	360	(56)
Section 199 domestic production deduction			(1,167)
Global intangible low-taxed income (GILTI)	438	840
Foreign derived intangible income deduction (FDII)	(1,120)	(1,531)
Foreign rate differential	(182)	495	(461)
Subpart F income	634	842	816
Tax benefits on stock-based compensation	(1,998)	(2,586)	(4,816)
Changes in tax contingencies - Increase/(Release)	269	13	(1,035)
Provision for state income taxes, net of federal benefit	1,412	1,251	975
Remeasurement of deferred taxes			(6,022)
Transition tax on foreign earnings and profits			1,223
Tax credits	(1,417)	(1,726)	(1,151)
Other	(750)	(80)	429
Provision for Income Taxes	$ 12,830	$ 12,783	$ 10,250

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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