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Segment Information - Additional Information (Detail) | 12 Months Ended
--- | ---
Sep. 30, 2014 Segment | Sep. 30, 2013 | Sep. 30, 2012
Segment Reporting Information [Line Items] |  |  |
Number of reportable segments | 3 |  |
Concentration of risk, percentage | 100.00% | 100.00% | 100.00%
Credit Concentration Risk |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration of risk, percentage | 15.00% | 16.00% | 18.00%
Sales Revenue, Services, Net |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk, number of customers | 0 | 0 | 0
Number of credit reporting agencies substantial revenues derived from | 3 |  |
Sales Revenue, Services, Net | Applications |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration of risk, percentage | 64.00% | 64.00% | 63.00%
Sales Revenue, Services, Net | Applications | Fraud Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration of risk, percentage | 23.00% | 22.00% | 25.00%
Sales Revenue, Services, Net | Applications | Customer Management Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration of risk, percentage | 10.00% | 11.00% | 13.00%
Sales Revenue, Services, Net | Applications | Collections & Recovery solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration of risk, percentage | 9.00% | 9.00% | 8.00%
Accounts Receivable |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk, number of customers | 0 | 0 |
Property Plant and Equipment |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk, number of countries | 0 | 0 |

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- Definition Concentration Risk, Number Of Countries + References No definition available. + Details
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- Definition Concentration Risk, Number Of Customers + References No definition available. + Details
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- Definition Number Of Credit Reporting Agencies Substantial Revenues Derived From + References No definition available. + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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- Details
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