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Segment Information - Additional Information (Detail) | 12 Months Ended
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Sep. 30, 2018 Segment customer | Sep. 30, 2017 customer | Sep. 30, 2016
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 | 57.00% | 59.00% | 61.00%
Sales Revenue | Product Concentration Risk | Applications | Fraud Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration of risk, Percentage | 17.00% | 19.00% | 20.00%
Sales Revenue | Product Concentration Risk | Applications | Customer Cummunication Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration of risk, Percentage | 10.00% | 10.00% | 9.00%
Sales Revenue | Product Concentration Risk | Applications | Customer Management Solutions |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration of risk, Percentage | 8.00% | 8.00% | 9.00%
Sales Revenue | Customer Concentration Risk |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration of risk, Percentage | 100.00% | 100.00% | 100.00%
Accounts Receivable | Customer Concentration Risk |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk, number of customers | customer | 0 | 0 |

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- Definition Concentration Risk, Number Of Customers + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + 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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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