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DERIVATIVES AND RISK MANAGEMENT (Narrative) (Details) - USD ($)
$ in Millions
May. 31, 2015
May. 31, 2014
Foreign exchange    
Derivative [Line Items]    
Derivative, Notional Amount $ 399.8 $ 457.7
Commodity    
Derivative [Line Items]    
Derivative, Notional Amount $ 46.5 $ 41.5