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INCOME TAX - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
May 31, 2016
May 31, 2015
May 31, 2014
Operating Loss Carryforwards [Line Items]      
Income tax expense (benefit) allocated to noncontrolling interest $ (7,300) $ (8,600) $ (5,200)
Undistributed earnings from foreign subsidiaries 931,000    
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability 12,700    
Capital loss carryforwards 1,500    
Changes in judgment regarding tax position 0 $ 65,591 $ 0
Unrecognized that would impact effective tax rate 7,800    
Foreign Tax Authority      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards 20,000    
Domestic Tax Authority      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards $ 33,400