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Commitments - Additional Information (Details)	12 Months Ended
	Sep. 30, 2023 executive
Commitments and Contingencies Disclosure [Abstract]
Number of executives in a management agreement providing for certain payments and other benefits in the event of a qualified change	19

X

- Definition

Number Of Executives Included In Plan

+ References

No definition available.

+ Details

Name:	fico_NumberOfExecutivesIncludedInPlan
Namespace Prefix:	fico_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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