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Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Nov. 30, 2011
Accounting Policies [Abstract]  
Schedule of Settlement Processing Assets and Liabilities [Table Text Block]

A summary of these amounts as of November 30, 2011 and May 31, 2011 is as follows:

 
November 30, 2011
 
May 31,
2011
Settlement processing assets:
(in thousands)
Interchange reimbursement
$
26,899

 
$
72,022

Receivable from Members
62,667

 
142,117

Receivable from networks
117,406

 
124,980

Exception items
959

 
4,456

Merchant Reserves
(1,289
)
 
(63,216
)
   Total
$
206,642

 
$
280,359

 
.

 
 
Settlement processing obligations:
 
 
 
Interchange reimbursement
$
203,495

 
$
212,069

Receivable from (liability to) Members
11,034

 
(718,650
)
Liability to merchants
(133,552
)
 
(129,806
)
Exception items
12,943

 
12,394

Merchant Reserves
(358,857
)
 
(208,195
)
Fair value of guarantees of customer chargebacks
(3,817
)
 
(3,102
)
Reserves for sales allowances
(1,536
)
 
(3,275
)
   Total
$
(270,290
)
 
$
(838,565
)
Schedule of Weighted Average Number of Shares [Table Text Block]

The following table sets forth the computation of diluted weighted average shares outstanding for the three and six months ended November 30, 2011 and 2010 (in thousands):

 
Three Months Ended November 30,
 
Six Months Ended November 30,
 
2011
 
2010
 
2011
 
2010
 
 
 
 
 
 
 
 
Basic weighted average shares outstanding    
78,348

 
79,701

 
79,207

 
79,642

Plus: dilutive effect of stock options and other share-based awards
528

 
643

 
624

 
670

Diluted weighted average shares outstanding    
78,876

 
80,344

 
79,831

 
80,312