Goodwill and Intangible Assets - Summary of Changes to Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Goodwill [Roll Forward]
Beginning Balance	$ 779,928	$ 773,931
Addition from acquisitions	46,149	5,129
Adjustment related to prior acquisitions		298
Foreign currency translation adjustment	(11,327)	570
Ending Balance	814,750	779,928
Applications
Goodwill [Roll Forward]
Beginning Balance	560,295	559,538
Addition from acquisitions	46,149	0
Adjustment related to prior acquisitions		298
Foreign currency translation adjustment	(9,679)	459
Ending Balance	596,765	560,295
Scores
Goodwill [Roll Forward]
Beginning Balance	146,648	146,648
Addition from acquisitions	0	0
Adjustment related to prior acquisitions		0
Foreign currency translation adjustment	0	0
Ending Balance	146,648	146,648
Tools
Goodwill [Roll Forward]
Beginning Balance	72,985	67,745
Addition from acquisitions	0	5,129
Adjustment related to prior acquisitions		0
Foreign currency translation adjustment	(1,648)	111
Ending Balance	$ 71,337	$ 72,985