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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, 2022	May 31, 2021	May 31, 2020
Components Of Deferred Income Tax Assets And Liabilities [Line Items]
Tax at U.S. statutory rate	$ 12,643	$ 15,806	$ 15,184
Permanent differences	67	292	360
Global intangible low-taxed income (GILTI)	1,501	2,064	438
Foreign derived intangible income deduction (FDII)	(1,308)	(1,210)	(1,120)
Foreign rate differential	215	669	(182)
Subpart F income	397	628	634
Tax benefits on stock-based compensation	(462)	(2,651)	(1,998)
Provision for state income taxes, net of federal benefit	1,517	1,601	1,412
Tax Credits	(2,527)	(3,298)	(1,417)
Impact of tax rate changes	583
Other	(726)	485	(481)
Income Tax Expense	$ 11,900	$ 14,386	$ 12,830

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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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