Segment Information - Summary of Segment Information (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment revenues:
Transactional and maintenance		$ 153,886	$ 144,695	$ 451,701	$ 414,788
Professional services		44,304	37,998	117,798	111,142
License		40,588	26,673	76,033	80,095
Total revenues		238,778	209,366	645,532	606,025
Segment operating expense		(183,459)	(172,312)	(520,855)	(509,692)
Segment operating income (loss)		55,319	37,054	124,677	96,333
Unallocated share-based compensation expense		(13,404)	(12,166)	(41,704)	(32,762)
Unallocated amortization expense	[1]	(3,486)	(3,599)	(10,573)	(10,046)
Unallocated restructuring and acquisition-related		0	(2,256)	0	(2,256)
Unallocated interest expense		(6,781)	(7,360)	(20,320)	(22,283)
Unallocated other income, net		1,752	770	1,853	771
Income before income taxes		50,290	30,464	106,210	74,821
Depreciation expense		4,473	5,447	12,554	16,047
Operating Segments
Segment revenues:
Segment operating expense		(166,569)	(154,291)	(468,578)	(464,628)
Segment operating income (loss)		72,209	55,075	176,954	141,397
Unallocated Corporate Expenses
Segment revenues:
Segment operating expense		(29,240)	(20,773)	(75,184)	(62,145)
Segment operating income (loss)		(29,240)	(20,773)	(75,184)	(62,145)
Depreciation expense		354	621	986	1,973
Applications | Operating Segments
Segment revenues:
Transactional and maintenance		82,925	79,731	244,659	238,597
Professional services		36,560	31,009	95,405	90,500
License		22,080	16,394	43,559	47,923
Total revenues		141,565	127,134	383,623	377,020
Segment operating expense		(92,532)	(90,228)	(267,924)	(274,157)
Segment operating income (loss)		49,033	36,906	115,699	102,863
Depreciation expense		2,961	3,734	8,413	10,948
Scores | Operating Segments
Segment revenues:
Transactional and maintenance		59,781	54,255	174,263	145,006
Professional services		822	615	2,682	2,369
License		527	884	1,303	2,257
Total revenues		61,130	55,754	178,248	149,632
Segment operating expense		(14,321)	(14,736)	(42,580)	(42,246)
Segment operating income (loss)		46,809	41,018	135,668	107,386
Depreciation expense		211	258	573	702
Tools | Operating Segments
Segment revenues:
Transactional and maintenance		11,180	10,709	32,779	31,185
Professional services		6,922	6,374	19,711	18,273
License		17,981	9,395	31,171	29,915
Total revenues		36,083	26,478	83,661	79,373
Segment operating expense		(30,476)	(28,554)	(82,890)	(86,080)
Segment operating income (loss)		5,607	(2,076)	771	(6,707)
Depreciation expense		$ 947	$ 834	$ 2,582	$ 2,424

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