Summary of Changes to Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jun. 30, 2014
Goodwill [Roll Forward]
Balance at September 30, 2013	$ 773,931
Addition from acquisitions	5,129
Adjustment related to prior acquisitions	(770)
Foreign currency translation adjustment	8,919
Balance at June 30, 2014	787,209
Applications
Goodwill [Roll Forward]
Balance at September 30, 2013	559,538
Addition from acquisitions	0
Adjustment related to prior acquisitions	(770)
Foreign currency translation adjustment	7,395
Balance at June 30, 2014	566,163
Scores
Goodwill [Roll Forward]
Balance at September 30, 2013	146,648
Addition from acquisitions	0
Adjustment related to prior acquisitions	0
Foreign currency translation adjustment	0
Balance at June 30, 2014	146,648
Tools
Goodwill [Roll Forward]
Balance at September 30, 2013	67,745
Addition from acquisitions	5,129
Adjustment related to prior acquisitions	0
Foreign currency translation adjustment	1,524
Balance at June 30, 2014	$ 74,398