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NONCONTROLLING INTERESTS - Reconciliation of Net Income Attributable to Non Controlling Interest (Details) - USD ($)
$ in Thousands
12 Months Ended
May 31, 2016
May 31, 2015
May 31, 2014
Noncontrolling Interest [Abstract]      
Net income attributable to noncontrolling interests $ 18,551 $ 31,075 $ 24,666
Foreign currency translation attributable to noncontrolling interests 471 (28,597) 7,054
Comprehensive income attributable to noncontrolling interests $ 19,022 $ 2,478 $ 31,720