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Goodwill and Intangible Assets - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Line Items]
Intangible assets, gross	$ 140.4	$ 141.2

X

- Details

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Namespace Prefix:	fico_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

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Balance Type:	debit
Period Type:	instant