Related Party Transactions - Additional Information (Detail)	Sep. 30, 2016 USD ($)
Related Party Transactions [Abstract]
Investment in convertible preferred stock in a private company	$ 10,000,000

Carrying amount as of the balance sheet date of investments in all related parties.

No definition available.

Name:	fico_InvestmentsInRelatedParties
Namespace Prefix:	fico_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant