Summary of Changes to Goodwill (Detail) $ in Thousands	3 Months Ended
	Dec. 31, 2015 USD ($)
Goodwill [Roll Forward]
Balance at September 30, 2015	$ 814,750
Foreign currency translation adjustment	(4,731)
Balance at December 31, 2015	810,019
Applications
Goodwill [Roll Forward]
Balance at September 30, 2015	596,765
Foreign currency translation adjustment	(4,340)
Balance at December 31, 2015	592,425
Scores
Goodwill [Roll Forward]
Balance at September 30, 2015	146,648
Foreign currency translation adjustment	0
Balance at December 31, 2015	146,648
Tools
Goodwill [Roll Forward]
Balance at September 30, 2015	71,337
Foreign currency translation adjustment	(391)
Balance at December 31, 2015	$ 70,946