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Noncontrolling Interests - Reconciliation of Net Income Attributable to Non Controlling Interest (Details) - USD ($)
$ in Thousands
12 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2013
Noncontrolling Interest [Abstract]      
Net income attributable to noncontrolling interests, net of tax $ 31,075 $ 24,666 $ 22,588
Foreign currency translation attributable to nonredeemable noncontrolling interests (28,597) 7,054 7,217
Foreign currency translation attributable to redeemable noncontrolling interest 0 0 573
Comprehensive income attributable to noncontrolling interests, net of tax $ 2,478 $ 31,720 $ 30,378