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Segment Information - Revenues And Percentage Of Revenues By Reportable Market Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 253,205 | $ 230,986 | $ 228,378 | $ 219,600 | $ 235,824 | $ 238,778 | $ 206,678 | $ 200,076 | $ 932,169 | $ 881,356 | $ 838,781
Product Concentration Risk | Sales Revenue |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration of risk, percentage |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Applications |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 553,167 | $ 532,642 | $ 526,274
Applications | Product Concentration Risk | Sales Revenue |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration of risk, percentage |  |  |  |  |  |  |  |  | 59.00% | 61.00% | 63.00%
Scores |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 266,354 | $ 241,059 | $ 207,007
Scores | Product Concentration Risk | Sales Revenue |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration of risk, percentage |  |  |  |  |  |  |  |  | 29.00% | 27.00% | 25.00%
Decision Management Software |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 112,648 | $ 107,655 | $ 105,500
Decision Management Software | Product Concentration Risk | Sales Revenue |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration of risk, percentage |  |  |  |  |  |  |  |  | 12.00% | 12.00% | 12.00%

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