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v3.25.3

Revenue from Contracts with Customers - Contract Balances - Additional Information (Details) | 12 Months Ended
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Sep. 30, 2025
Minimum |
Disaggregation of Revenue [Line Items] |
Contract with customer, payment term | 30 days
Maximum |
Disaggregation of Revenue [Line Items] |
Contract with customer, payment term | 60 days

X
- Definition Contract With Customer, Payment Term + References No definition available. + Details
Name: | fico_ContractWithCustomerPaymentTerm
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
Name: | us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |