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Goodwill and Intangible Assets - Summary of Changes to Goodwill (Detail) $ in Thousands	9 Months Ended
	Jun. 30, 2021 USD ($)
Goodwill [Roll Forward]
Balance at September 30, 2020	$ 812,364
Foreign currency translation adjustment	6,417
C&R business divestiture	(25,596)
Balance at June 30, 2021	793,185
Applications
Goodwill [Roll Forward]
Balance at September 30, 2020	596,804
Foreign currency translation adjustment	5,265
C&R business divestiture	(25,596)
Balance at June 30, 2021	576,473
Scores
Goodwill [Roll Forward]
Balance at September 30, 2020	146,648
Foreign currency translation adjustment	0
C&R business divestiture	0
Balance at June 30, 2021	146,648
Decision Management Software
Goodwill [Roll Forward]
Balance at September 30, 2020	68,912
Foreign currency translation adjustment	1,152
C&R business divestiture	0
Balance at June 30, 2021	$ 70,064

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
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-Topic 350
-SubTopic 20
-Section 45
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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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