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Noncontrolling Interests - Schedule of Redeemable Noncontrolling Interest (Details) - USD ($)
$ in Thousands
12 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2013
Increase (Decrease) in Temporary Equity [Roll Forward]      
Beginning balance   $ 0 $ 144,422
Net income attributable to redeemable noncontrolling interest $ 0 $ 0 1,814
Foreign currency translation adjustment     573
Decrease in the maximum redemption amount of redeemable noncontrolling interest     (817)
Derecognition of redeemable noncontrolling interest     145,992
Ending balance     $ 0