Summary of Changes to Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2014
Goodwill [Roll Forward]
Balance at September 30, 2014	$ 779,928
Foreign currency translation adjustment	(5,821)
Balance at December 31, 2014	774,107
Applications
Goodwill [Roll Forward]
Balance at September 30, 2014	560,295
Foreign currency translation adjustment	(4,835)
Balance at December 31, 2014	555,460
Scores
Goodwill [Roll Forward]
Balance at September 30, 2014	146,648
Foreign currency translation adjustment	0
Balance at December 31, 2014	146,648
Tools
Goodwill [Roll Forward]
Balance at September 30, 2014	72,985
Foreign currency translation adjustment	(986)
Balance at December 31, 2014	$ 71,999