Segment Information - Summary of Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment revenues:
Total revenues	$ 348,966	$ 338,184	$ 1,028,522	$ 981,959
Segment operating expense	(208,351)	(143,800)	(620,264)	(591,655)
Operating income	140,615	194,384	408,258	390,304
Unallocated share-based compensation expense	(28,549)	(30,761)	(86,363)	(84,099)
Unallocated amortization expense	(532)	(810)	(1,619)	(2,692)
Gains on product line asset sales and business divestiture	0	92,805	0	100,139
Unallocated interest expense	(18,721)	(10,018)	(48,127)	(29,602)
Unallocated other expense, net	(1,000)	3,526	(1,932)	6,974
Income before income taxes	120,894	187,892	358,199	367,676
Depreciation expense	3,773	5,051	11,895	15,860
Operating Segments
Segment revenues:
Segment operating expense	(179,270)	(205,034)	(532,282)	(605,003)
Operating income	169,696	133,150	496,240	376,956
Unallocated Corporate Expenses
Segment revenues:
Segment operating expense	(38,015)	(33,820)	(109,483)	(97,465)
Operating income	(38,015)	(33,820)	(109,483)	(97,465)
Depreciation expense	26	38	83	116
Scores
Segment revenues:
Total revenues	179,355	172,202	532,584	485,572
Scores | Operating Segments
Segment revenues:
Total revenues	179,355	172,202	532,584	485,572
Segment operating expense	(19,207)	(25,418)	(62,217)	(69,221)
Operating income	160,148	146,784	470,367	416,351
Depreciation expense	182	159	563	520
Software
Segment revenues:
Total revenues	169,611	165,982	495,938	496,387
Software | Operating Segments
Segment revenues:
Total revenues	169,611	165,982	495,938	496,387
Segment operating expense	(122,048)	(145,796)	(360,582)	(438,317)
Operating income	47,563	20,186	135,356	58,070
Depreciation expense	3,565	4,854	11,249	15,224
Professional services
Segment revenues:
Total revenues	27,074	35,752	77,975	114,151
Professional services | Operating Segments
Segment revenues:
Total revenues			77,975	114,151
Professional services | Scores | Operating Segments
Segment revenues:
Total revenues	0	0	0	0
Professional services | Software | Operating Segments
Segment revenues:
Total revenues	27,074	35,752	77,975	114,151
On-premises and SaaS software
Segment revenues:
Total revenues	142,537	130,230	417,963	382,236
On-premises and SaaS software | Operating Segments
Segment revenues:
Total revenues			417,963	382,236
On-premises and SaaS software | Scores | Operating Segments
Segment revenues:
Total revenues	0	0	0	0
On-premises and SaaS software | Software
Segment revenues:
Total revenues	142,537	130,230	417,963	382,236
On-premises and SaaS software | Software | Operating Segments
Segment revenues:
Total revenues	142,537	130,230	417,963	382,236
Scores
Segment revenues:
Total revenues	179,355	172,202	532,584	485,572
Scores | Operating Segments
Segment revenues:
Total revenues			532,584	485,572
Scores | Scores | Operating Segments
Segment revenues:
Total revenues	179,355	172,202	532,584	485,572
Scores | Software | Operating Segments
Segment revenues:
Total revenues	$ 0	$ 0	$ 0	$ 0