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Income Tax - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2013
May. 31, 2012
Operating Loss Carryforwards [Line Items]        
Income tax expense (benefit) allocated to noncontrolling interest $ 8,600 $ 5,200 $ 4,200  
Capital Loss Carryforwards 8,400      
Deferred tax liability not recognized 696,900      
Unrecognized tax benefits 2,559 $ 67,576 $ 53,763 $ 45,595
Unrecognized that would impact effective tax rate 2,600      
Foreign Tax Authority        
Operating Loss Carryforwards [Line Items]        
Operating Loss Carryforwards 12,400      
Domestic Tax Authority        
Operating Loss Carryforwards [Line Items]        
Operating Loss Carryforwards 19,800      
Capital Loss Carryforward | Domestic Tax Authority        
Operating Loss Carryforwards [Line Items]        
Capital Loss Carryforwards 4,700      
Interest and Other Expense        
Operating Loss Carryforwards [Line Items]        
Unrecognized tax benefits, interest on income taxes $ 3,600