XML 66 R57.htm IDEA: XBRL DOCUMENT
v3.23.3

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Commitments and Contingencies Disclosure [Abstract] |  |
Commitments outstanding to fund various undrawn revolving loans, other debt investments and capital commitments. | $ 7,291 | $ 16,915

X
- 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

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