Segment Information - Additional Information (Detail)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting Information [Line Items]
Concentration of risk percentage	100.00%	100.00%	100.00%
Credit Concentration Risk
Segment Reporting Information [Line Items]
Concentration of risk percentage	16.00%	18.00%	18.00%
Sales Revenue, Services, Net | Applications
Segment Reporting Information [Line Items]
Concentration of risk percentage	64.00%	63.00%	62.00%
Sales Revenue, Services, Net | Applications | Fraud Solutions
Segment Reporting Information [Line Items]
Concentration of risk percentage	22.00%	25.00%	23.00%
Sales Revenue, Services, Net | Applications | Customer Management Solutions
Segment Reporting Information [Line Items]
Concentration of risk percentage	11.00%	13.00%	13.00%
Sales Revenue, Services, Net | Applications | Collections & Recovery solutions
Segment Reporting Information [Line Items]
Concentration of risk percentage	9.00%	8.00%	8.00%