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Cover Page
Mar. 12, 2025
Document Information [Line Items]  
Entity Registrant Name Fidus Investment Corporation
Amendment Flag false
Entity Central Index Key 0001513363
Document Type 8-K
Document Period End Date Mar. 12, 2025
Securities Act File Number 814-00861
Entity Tax Identification Number 27-5017321
Entity Address, Address Line One 1603 Orrington Avenue
Entity Address, Address Line Two Suite 1005
Entity Address, City or Town Evanston
Entity Incorporation, State or Country Code MD
Entity Address, Postal Zip Code 60201
Entity Address, State or Province IL
City Area Code 847
Local Phone Number 859-3940
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, par value $0.001 per share
Trading Symbol FDUS
Entity Emerging Growth Company false
Security Exchange Name NASDAQ