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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, 2018 | May 31, 2017 | May 31, 2016
Components Of Deferred Income Tax Assets And Liabilities [Line Items] |  |  |
Tax at U.S. statutory rate | $ 21,459 | $ 23,336 | $ 19,429
Section 199 domestic production deduction | (1,167) | (1,057) | (1,143)
Foreign rate differential | (461) | (1,247) | (699)
Subpart F income | 816 | 996 | 1,049
Excess tax benefits on stock-based compensation | (4,816) |  |
Release of FIN 48 reserve from closed tax years | (1,035) |  |
Provision for state income taxes, net of federal benefit | 975 | 972 | 779
Remeasurement of deferred taxes | (6,022) |  |
Transition tax on foreign earnings and profits | 1,223 |  |
Amended U.S. Federal tax returns FY12, FY13 & FY14 |  |  | (777)
Tax credits and other | (722) | (300) | 337
Provision for Income Taxes | $ 10,250 | $ 22,700 | $ 18,975

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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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