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Goodwill and Intangible Assets - Summary of Changes to Goodwill (Detail)
$ in Thousands
 3 Months Ended
Dec. 31, 2017
USD ($)
Goodwill [Roll Forward]  
Balance at September 30, 2017 $ 804,414
Foreign currency translation adjustment 1,918
Balance at December 31, 2017 806,332
Applications  
Goodwill [Roll Forward]  
Balance at September 30, 2017 588,288
Foreign currency translation adjustment 1,777
Balance at December 31, 2017 590,065
Scores  
Goodwill [Roll Forward]  
Balance at September 30, 2017 146,648
Foreign currency translation adjustment 0
Balance at December 31, 2017 146,648
Decision Management Software  
Goodwill [Roll Forward]  
Balance at September 30, 2017 69,478
Foreign currency translation adjustment 141
Balance at December 31, 2017 $ 69,619