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Guarantees - Additional Information (Detail)	12 Months Ended
	Sep. 30, 2017
Maximum
Product Warranty [Line Items]
Duration of product warranties	90 days

X

- Definition

Product Warranty [Line Items]

+ References

No definition available.

+ Details

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

X

- Definition

Product Warranty Term

+ References

No definition available.

+ Details

Name:	fico_ProductWarrantyTerm
Namespace Prefix:	fico_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: