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Contract Balances and Performance Obligations - Additional (Details) $ in Millions	9 Months Ended
	Jun. 30, 2021 USD ($)
Revenue from External Customer [Line Items]
Revenue, remaining performance obligation, amount	$ 54.9
Minimum
Revenue from External Customer [Line Items]
Contract With Customer, Payment Term	30 days
Maximum
Revenue from External Customer [Line Items]
Contract With Customer, Payment Term	60 days

X

- Definition

Contract With Customer, Payment Term

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
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