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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, 2017	May 31, 2016	May 31, 2015
Components Of Deferred Income Tax Assets And Liabilities [Line Items]
Tax at U.S. statutory rate	$ 23,336	$ 19,429	$ 18,227
Section 199 domestic production deduction	(1,057)	(1,143)	(1,067)
Foreign rate differential	(1,247)	(699)	(949)
Subpart F income	996	1,049	1,396
Tax credits and other	(300)	337	39
Provision for state income taxes, net of federal benefit	972	779	854
Amended U.S. Federal tax returns, FY12, FY13 & FY14		(777)
Provision for Income Taxes	$ 22,700	$ 18,975	$ 18,500

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Components Of Deferred Income Tax Assets And Liabilities [Line Items]

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Income tax reconciliation subpart f income.

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Income Tax Reconciliation Tax Credits and Other

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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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Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax expense (benefit).

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