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Segment Information - Additional Information (Detail) | 12 Months Ended
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Sep. 30, 2016 Segment country customer agency | Sep. 30, 2015 country customer | Sep. 30, 2014 customer
Segment Reporting Information [Line Items] |  |  |
Number of reportable segments | Segment | 3 |  |
Geographic Concentration Risk |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration of risk, percentage | 100.00% | 100.00% | 100.00%
Sales Revenue | Product Concentration Risk |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration of risk, percentage | 100.00% | 100.00% | 100.00%
Sales Revenue | Product Concentration Risk | Applications |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration of risk, percentage | 61.00% | 63.00% | 64.00%
Sales Revenue | Product Concentration Risk | Applications | Fraud Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration of risk, percentage | 20.00% | 23.00% | 23.00%
Sales Revenue | Product Concentration Risk | Applications | Customer Management Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration of risk, percentage | 9.00% | 9.00% | 10.00%
Sales Revenue | Customer Concentration Risk |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration of risk, percentage | 19.00% | 16.00% | 15.00%
Concentration risk, number of customers | 0 | 0 | 0
Number of credit reporting agencies substantial revenues derived from | agency | 3 |  |
Accounts Receivable | Customer Concentration Risk |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk, number of customers | 0 | 0 |
Property Plant and Equipment | Geographic Concentration Risk |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk, number of countries | country | 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 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592 Reference 2: 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=49121117&loc=d3e13531-108611 Reference 3: 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=51801978&loc=d3e6404-108592 Reference 4: 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=49121117&loc=d3e13537-108611 + 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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