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Summary of Changes to Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended				6 Months Ended
	Mar. 31, 2014	Mar. 31, 2014 Applications	Mar. 31, 2014 Scores	Sep. 30, 2013 Scores	Mar. 31, 2014 Tools
Goodwill [Line Items]
Beginning Balance	$ 773,931	$ 559,538	$ 146,648	$ 146,648	$ 67,745
Adjustments related to prior acquisitions	(770)	(770)
Foreign currency translation adjustment	5,016	4,153			863
Ending Balance	$ 778,177	$ 562,921	$ 146,648	$ 146,648	$ 68,608

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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

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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

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-Publisher FASB

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-Topic 350

-SubTopic 20

-Section 50

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+ References

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