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Debt - Information about Senior Securities (Parenthetical) (Details) $ in Thousands	Dec. 31, 2022 USD ($)
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

X

- 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

X

- 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

X

- 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

X

- References

No definition available.

+ Details

Name:	us-gaap_DebtDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration