Goodwill and Intangible Assets - Summary of Changes to Goodwill (Detail) $ in Thousands	6 Months Ended
	Mar. 31, 2016 USD ($)
Goodwill [Roll Forward]
Balance at September 30, 2015	$ 814,750
Adjustment related to prior acquisitions	283
Foreign currency translation adjustment	(6,741)
Balance at March 31, 2016	808,292
Applications
Goodwill [Roll Forward]
Balance at September 30, 2015	596,765
Adjustment related to prior acquisitions	283
Foreign currency translation adjustment	(5,953)
Balance at March 31, 2016	591,095
Scores
Goodwill [Roll Forward]
Balance at September 30, 2015	146,648
Adjustment related to prior acquisitions	0
Foreign currency translation adjustment	0
Balance at March 31, 2016	146,648
Tools
Goodwill [Roll Forward]
Balance at September 30, 2015	71,337
Adjustment related to prior acquisitions	0
Foreign currency translation adjustment	(788)
Balance at March 31, 2016	$ 70,549