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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

X

- Definition

Concentration Risk, Number Of Customers

+ References

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- Definition

Number Of Credit Reporting Agencies Substantial Revenues Derived From

+ References

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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

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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

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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.

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