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Goodwill and Intangible Assets - Summary of Changes to Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Goodwill [Roll Forward]
Beginning Balance	$ 798,415	$ 814,750
Addition from acquisitions		3,857
Adjustment related to prior acquisitions		283
Foreign currency translation adjustment	5,999	(20,475)
Ending Balance	804,414	798,415
Applications
Goodwill [Roll Forward]
Beginning Balance	582,720	596,765
Addition from acquisitions		3,857
Adjustment related to prior acquisitions		283
Foreign currency translation adjustment	5,568	(18,185)
Ending Balance	588,288	582,720
Scores
Goodwill [Roll Forward]
Beginning Balance	146,648	146,648
Addition from acquisitions		0
Adjustment related to prior acquisitions		0
Foreign currency translation adjustment	0	0
Ending Balance	146,648	146,648
Decision Management Software
Goodwill [Roll Forward]
Beginning Balance	69,047	71,337
Addition from acquisitions		0
Adjustment related to prior acquisitions		0
Foreign currency translation adjustment	431	(2,290)
Ending Balance	$ 69,478	$ 69,047

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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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-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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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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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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-Publisher FASB
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-Topic 350
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-Section 50
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- Definition

Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the 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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e961-128460

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