Accounts Payable and Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	May 31, 2012	May 31, 2011
Accounts Payable and Accrued Liabilities [Abstract]
Trade accounts payable	$ 11,817	$ 20,053
Compensation and benefits	36,116	37,033
Third party processing expenses	10,578	14,254
Commissions to third parties	64,581	49,868
Accrued fees and assessment expenses	27,149	21,468
Transition services payable to HSBC UK, HSBC Asia Pacific and Comercia	17,920	25,489
Accrued processing system intrusion costs	79,666	0
Other	68,486	73,413
Accounts payable and accrued liabilities	$ 316,313	$ 241,578