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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%