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Goodwill and Intangible Assets - Summary of Changes to Goodwill (Detail)
$ in Thousands
 9 Months Ended
Jun. 30, 2017
USD ($)
Goodwill [Roll Forward]  
Balance at September 30, 2016 $ 798,415
Foreign currency translation adjustment 1,376
Balance at June 30, 2017 799,791
Applications  
Goodwill [Roll Forward]  
Balance at September 30, 2016 582,720
Foreign currency translation adjustment 1,305
Balance at June 30, 2017 584,025
Scores  
Goodwill [Roll Forward]  
Balance at September 30, 2016 146,648
Foreign currency translation adjustment 0
Balance at June 30, 2017 146,648
Decision Management Software  
Goodwill [Roll Forward]  
Balance at September 30, 2016 69,047
Foreign currency translation adjustment 71
Balance at June 30, 2017 $ 69,118