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Income Taxes (Details 2) - USD ($) $ in Thousands | 12 Months Ended
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May 31, 2016 | May 31, 2015 | May 31, 2014
Summary of significant components of deferred income tax (benefit) expense from operations |  |  |
Net effect of temporary differences | $ 133 | $ (1,916) | $ 1,543
Adjustments for beginning-of-the-year valuation allowance balance for changes in circumstances | 40,418 | 0 | 0
Impact of NYS tax reform legislation | 0 | 0 | 1,173
Net operating loss carryforward | (568) | (3,207) | 0
Deferred Income Tax Expense (Benefit) | $ 39,983 | $ (5,123) | $ 2,716

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