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Segment Information - Additional Information (Detail) | 12 Months Ended
--- | ---
Sep. 30, 2017 Segment customer agency | Sep. 30, 2016 customer | Sep. 30, 2015 customer
Segment Reporting Information [Line Items] |  |  |
Number of reportable segments | Segment | 3 |  |
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 | 59.00% | 61.00% | 63.00%
Sales Revenue | Product Concentration Risk | Applications | Fraud Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration of risk, percentage | 19.00% | 20.00% | 23.00%
Sales Revenue | Product Concentration Risk | Applications | Customer Cummunication Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration of risk, percentage | 10.00% | 9.00% | 8.00%
Sales Revenue | Product Concentration Risk | Applications | Customer Management Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration of risk, percentage | 8.00% | 9.00% | 9.00%
Sales Revenue | Customer Concentration Risk |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration of risk, percentage | 20.00% | 19.00% | 16.00%
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 |

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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=84177426&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=77997519&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=84177426&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=77997519&loc=d3e13537-108611 + Details
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