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Income Taxes - Components of Income Tax Expense/(Benefit) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Nov. 30, 2015 | Nov. 30, 2014 | Nov. 30, 2015 | Nov. 30, 2014
Income Tax Disclosure [Abstract] |  |  |  |
Income (loss) before income tax expense (benefit) | $ (728) | $ 2,829 | $ (1,402) | $ 4,247
Non-taxable portion of change in fair value of contingent consideration | 0 | 0 | 170 | 0
Ordinary income (loss) before income taxes | (728) | 2,829 | (1,572) | 4,247
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount [Abstract] |  |  |  |
Income tax expense / (benefit) based on ordinary income / (loss) at estimated tax rates | (429) | 1,140 | (792) | 1,738
Discrete tax expense (benefit): |  |  |  |
Adjustment for elimination of the ASC 718 APIC pool | 43 | 330 | 514 | 685
Adjustments to prior period tax liabilities | 20 | 21 | (5) | 16
Total income tax expense (benefit) | $ (366) | $ 1,491 | $ (283) | $ 2,439

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