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Related Party Transactions - Additional Information (Detail) | Sep. 30, 2017 USD ($)
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Related Party Transactions [Abstract] |
Investment in convertible preferred stock in a private company | $ 10,000,000

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- Definition Carrying amount as of the balance sheet date of investments in all related parties. + References No definition available. + Details
Name: | fico_InvestmentsInRelatedParties
Namespace Prefix: | fico_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration