Goodwill and Intangible Assets - Summary of Changes to Goodwill (Detail) $ in Thousands	9 Months Ended
	Jun. 30, 2016 USD ($)
Goodwill [Roll Forward]
Balance at September 30, 2015	$ 814,750
Addition from acquisitions	3,857
Adjustment related to prior acquisitions	283
Foreign currency translation adjustment	(16,688)
Balance at June 30, 2016	802,202
Applications
Goodwill [Roll Forward]
Balance at September 30, 2015	596,765
Addition from acquisitions	3,857
Adjustment related to prior acquisitions	283
Foreign currency translation adjustment	(14,885)
Balance at June 30, 2016	586,020
Scores
Goodwill [Roll Forward]
Balance at September 30, 2015	146,648
Addition from acquisitions	0
Adjustment related to prior acquisitions	0
Foreign currency translation adjustment	0
Balance at June 30, 2016	146,648
Tools
Goodwill [Roll Forward]
Balance at September 30, 2015	71,337
Addition from acquisitions	0
Adjustment related to prior acquisitions	0
Foreign currency translation adjustment	(1,803)
Balance at June 30, 2016	$ 69,534