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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Commitments and Contingencies Disclosure [Abstract] |  |
Commitments outstanding to fund various undrawn revolving loans, other debt investments and capital commitments. | $ 16,915 | $ 8,170

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- Definition Commitments outstanding to fund various undrawn revolving loans, other debt investments and capital commitments. + References No definition available. + Details
Name: | fdus_CommitmentsOutstandingToFundVariousUndrawnRevolvingLoansOtherDebtInvestmentsAndCapitalCommitments
Namespace Prefix: | fdus_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration