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

X

- 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

X

- References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration