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Income Taxes - Provision (Benefit) for Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
May 31, 2013
May 31, 2012
May 31, 2011
Income Tax Disclosure [Abstract]      
Current $ (110) $ 964 $ 1,071
Deferred (13,656) (2,605) (44,948)
Income taxes (benefit) $ (13,766) $ (1,641) $ (43,877)