Summary of Changes to Goodwill (Detail) $ in Thousands	9 Months Ended
	Jun. 30, 2015 USD ($)
Goodwill [Roll Forward]
Balance at September 30, 2014	$ 779,928
Addition from acquisitions	46,193
Foreign currency translation adjustment	(7,169)
Balance at June 30, 2015	818,952
Applications
Goodwill [Roll Forward]
Balance at September 30, 2014	560,295
Addition from acquisitions	46,193
Foreign currency translation adjustment	(6,277)
Balance at June 30, 2015	600,211
Scores
Goodwill [Roll Forward]
Balance at September 30, 2014	146,648
Addition from acquisitions	0
Foreign currency translation adjustment	0
Balance at June 30, 2015	146,648
Tools
Goodwill [Roll Forward]
Balance at September 30, 2014	72,985
Addition from acquisitions	0
Foreign currency translation adjustment	(892)
Balance at June 30, 2015	$ 72,093