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Goodwill and Intangible Assets - Summary of Changes to Goodwill (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Goodwill [Roll Forward] |  |
Beginning Balance | $ 804,414 | $ 798,415
Foreign currency translation adjustment | (3,524) | 5,999
Ending Balance | 800,890 | 804,414
Applications |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 588,288 | 582,720
Foreign currency translation adjustment | (3,127) | 5,568
Ending Balance | 585,161 | 588,288
Scores |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 146,648 | 146,648
Foreign currency translation adjustment | 0 | 0
Ending Balance | 146,648 | 146,648
Decision Management Software |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 69,478 | 69,047
Foreign currency translation adjustment | (397) | 431
Ending Balance | $ 69,081 | $ 69,478

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- 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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