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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, 2021	May 31, 2020	May 31, 2019
Components Of Deferred Income Tax Assets And Liabilities [Line Items]
Tax at U.S. statutory rate	$ 15,806	$ 15,184	$ 15,321
Permanent differences	292	360	(56)
Global intangible low-taxed income (GILTI)	2,064	438	840
Foreign derived intangible income deduction (FDII)	(1,210)	(1,120)	(1,531)
Foreign rate differential	669	(182)	495
Subpart F income	628	634	842
Tax benefits on stock-based compensation	(2,651)	(1,998)	(2,586)
Changes in tax contingencies—Increase/(Release)	(76)	269	13
Provision for state income taxes, net of federal benefit	1,601	1,412	1,251
Tax Credits	(3,298)	(1,417)	(1,726)
Other	561	(750)	(80)
Provision for Income Taxes	$ 14,386	$ 12,830	$ 12,783

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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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