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Summary of Significant Accounting Policies - Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
May. 31, 2015
May. 31, 2014
Cash and Cash Equivalents [Line Items]    
Settlement processing assets $ 2,394,822 $ 780,917
Cash and Cash Equivalents    
Cash and Cash Equivalents [Line Items]    
Settlement processing assets $ 180,200 $ 124,700