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v3.20.2

Subsequent Events - Additional Information (Details) - Subsequent Event - USD ($) $ in Millions | Oct. 31, 2020 | Oct. 30, 2020
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Subsequent Event [Line Items] |  |
Long-term Purchase Commitment, Amount | $ 120 |
Long-term Purchase Commitment, Period | 5 years |
Other Commitment |  | $ 12
Long-Term Purchase Commitment, Period One |  |
Subsequent Event [Line Items] |  |
Long-term Purchase Commitment, Period | 3 years |
Long-Term Purchase Commitment, Period Two |  |
Subsequent Event [Line Items] |  |
Long-term Purchase Commitment, Period | 1 year |

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- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
Name: | us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_LongtermPurchaseCommitmentPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | fico_LongTermPurchaseCommitmentPeriodsAxis=fico_LongTermPurchaseCommitmentPeriodOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | fico_LongTermPurchaseCommitmentPeriodsAxis=fico_LongTermPurchaseCommitmentPeriodTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |