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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, 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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- Definition Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss), attributable to excess tax benefit for share-based compensation costs. + References No definition available. + Details
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