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Segment Information - Additional Information (Detail)
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
Segment Reporting Information [Line Items]   
Concentration of risk percentage100.00%100.00%100.00%
Applications | Sales Revenue, Services, Net | Customer Management Solutions
   
Segment Reporting Information [Line Items]   
Concentration of risk percentage13.00%14.00%15.00%
Applications | Sales Revenue, Services, Net | Fraud Solutions
   
Segment Reporting Information [Line Items]   
Concentration of risk percentage23.00%20.00%20.00%
Applications | Sales Revenue, Services, Net | Marketing Solutions
   
Segment Reporting Information [Line Items]   
Concentration of risk percentage10.00%11.00%9.00%
Credit Concentration Risk
   
Segment Reporting Information [Line Items]   
Concentration of risk percentage18.00%20.00%19.00%