Segment Information - Summary of Segment Information (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Segment revenues:
Transactional and maintenance		$ 150,743	$ 138,683	$ 297,815	$ 270,093
Professional services		39,342	37,946	73,494	73,144
License		16,593	30,480	35,445	53,422
Total revenues		206,678	207,109	406,754	396,659
Segment operating expense		(168,154)	(172,710)	(337,396)	(337,380)
Operating income (loss)		38,524	34,399	69,358	59,279
Unallocated share-based compensation expense		(13,600)	(11,802)	(28,300)	(20,596)
Unallocated amortization expense	[1]	(3,507)	(3,515)	(7,087)	(6,447)
Unallocated interest expense		(6,815)	(7,718)	(13,539)	(14,923)
Unallocated other income (expense), net		435	(648)	101	1
Income before income taxes		32,144	26,033	55,920	44,357
Depreciation expense		4,220	5,425	8,081	10,600
Operating Segments
Segment revenues:
Segment operating expense		(151,047)	(157,393)	(302,009)	(310,337)
Operating income (loss)		55,631	49,716	104,745	86,322
Unallocated Corporate Expenses
Segment revenues:
Segment operating expense		(21,882)	(19,753)	(45,944)	(41,372)
Operating income (loss)		(21,882)	(19,753)	(45,944)	(41,372)
Depreciation expense		327	685	632	1,352
Applications | Operating Segments
Segment revenues:
Transactional and maintenance		80,751	80,315	161,734	158,866
Professional services		31,719	30,992	58,845	59,491
License		9,447	23,081	21,479	31,529
Total revenues		121,917	134,388	242,058	249,886
Segment operating expense		(87,955)	(95,035)	(175,392)	(183,929)
Operating income (loss)		33,962	39,353	66,666	65,957
Depreciation expense		2,708	3,706	5,452	7,214
Scores | Operating Segments
Segment revenues:
Transactional and maintenance		59,265	47,814	114,482	90,751
Professional services		1,112	966	1,860	1,754
License		739	1,157	776	1,373
Total revenues		61,116	49,937	117,118	93,878
Segment operating expense		(14,090)	(14,618)	(28,259)	(27,510)
Operating income (loss)		47,026	35,319	88,859	66,368
Depreciation expense		185	227	362	444
Tools | Operating Segments
Segment revenues:
Transactional and maintenance		10,727	10,554	21,599	20,476
Professional services		6,511	5,988	12,789	11,899
License		6,407	6,242	13,190	20,520
Total revenues		23,645	22,784	47,578	52,895
Segment operating expense		(27,120)	(27,987)	(52,414)	(57,526)
Operating income (loss)		(3,475)	(5,203)	(4,836)	(4,631)
Depreciation expense		$ 1,000	$ 807	$ 1,635	$ 1,590

[1] Cost of revenues and selling, general and administrative expenses exclude the amortization of intangible assets. See Note 5.