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Income Taxes (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
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