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Goodwill and Intangible Assets - Summary of Changes to Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Goodwill [Roll Forward]
Beginning Balance	$ 800,890	$ 804,414
Goodwill, Acquired During Period	11,233
Foreign currency translation adjustment	(8,581)	(3,524)
Ending Balance	803,542	800,890
Applications
Goodwill [Roll Forward]
Beginning Balance	585,161	588,288
Goodwill, Acquired During Period	11,233
Foreign currency translation adjustment	(7,780)	(3,127)
Ending Balance	588,614	585,161
Scores
Goodwill [Roll Forward]
Beginning Balance	146,648	146,648
Goodwill, Acquired During Period	0
Foreign currency translation adjustment	0	0
Ending Balance	146,648	146,648
Decision Management Software
Goodwill [Roll Forward]
Beginning Balance	69,081	69,478
Goodwill, Acquired During Period	0
Foreign currency translation adjustment	(801)	(397)
Ending Balance	$ 68,280	$ 69,081

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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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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