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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, unless otherwise specified	12 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2012
Components Of Deferred Income Tax Assets And Liabilities [Line Items]
Tax at U.S. statutory rates	$ 15,061	$ 14,400	$ 11,900
Tax credits and other	(574)	(980)	(755)
Provisions for state income taxes, net of federal benefit	513	680	305
Provision for Income Taxes	$ 15,000	$ 14,100	$ 11,450

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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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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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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 state and local income tax expense (benefit).

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