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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
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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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