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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, 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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Tax cuts and jobs act of 2017 change in tax rate deferred income tax expense benefit.

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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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