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OTHER ASSETS (Details)
$ in Millions
 12 Months Ended
May 31, 2016
EUR (€)
Jun. 21, 2016
USD ($)
Other Assets [Line Items]    
Cost Method Investments, Original Cost € 30  
Cash consideration received from sale 33,500,000  
Amount of deferred compensation received € 3,100,000  
Percentage of interest compounded annually 4.00%  
Period of conversion of preferred shares into common shares 12 years  
Maximum    
Other Assets [Line Items]    
Cost Method Investment, Deferred Compensation € 25,600,000  
Minimum    
Other Assets [Line Items]    
Contingent earn out consideration € 0  
Subsequent Event    
Other Assets [Line Items]    
Cash consideration received from sale | $   $ 37.7
Equity interest received from sale | $   22.9
Amount of deferred compensation received | $   3.4
Subsequent Event | Maximum    
Other Assets [Line Items]    
Cost Method Investment, Deferred Compensation | $   $ 28.8