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Income Tax - Net Deferred Tax Asset and Liability (Details) - USD ($)
$ in Thousands
May. 31, 2015
May. 31, 2014
Income Tax Disclosure [Abstract]    
Noncurrent deferred income tax asset $ 30,428 $ 101,940
Noncurrent deferred income tax liability (202,855) (196,224)
Net non-current deferred income tax liability $ 172,427 $ 94,284