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Accounts Payable and Accrued Liabilities (Details) - USD ($)
$ in Thousands
May. 31, 2015
May. 31, 2014
Accounts Payable and Accrued Liabilities [Abstract]    
Trade accounts payable $ 22,836 $ 13,076
Compensation and benefits 57,238 61,193
Third party processing expenses 4,399 11,062
Commissions to third parties 63,737 66,551
Accrued fees and assessment expenses 39,417 51,649
Other 125,020 86,499
Accounts payable and accrued liabilities $ 312,647 $ 290,030