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Debt - Information about Senior Securities (Parenthetical) (Details) $ in Thousands | Dec. 31, 2022 USD ($)
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Debt Disclosure [Abstract] |
Indebtedness threshold asset coverage ratio per unit. | $ 1,000
Senior Security Indebtedness Threshold per Average Market Value per Unit | 1,000
Average market value per Unit increase amount | $ 25

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- Definition Debt instrument average market value per unit increase amount. + References No definition available. + Details
Name: | fdus_DebtInstrumentAverageMarketValuePerUnitIncreaseAmount
Namespace Prefix: | fdus_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Senior security indebtedness threshold asset coverage ratio per unit. + References No definition available. + Details
Name: | fdus_SeniorSecurityIndebtednessThresholdAssetCoverageRatioPerUnit
Namespace Prefix: | fdus_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Senior security indebtedness threshold per average market value per unit. + References No definition available. + Details
Name: | fdus_SeniorSecurityIndebtednessThresholdPerAverageMarketValuePerUnit
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_DebtDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration