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INCOME TAX - Net Deferred Tax Asset and Liability (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
May 31, 2016
May 31, 2015
Income Tax Disclosure [Abstract]      
Noncurrent deferred income tax asset $ 15,789 $ 22,719 $ 30,428
Noncurrent deferred income tax liability (676,472) (744,862) (202,855)
Net non-current deferred income tax liability $ (660,683) $ (722,143) $ (172,427)