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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2022
Feb. 28, 2023
Jun. 30, 2022
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2022    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Trading Symbol FDUS    
Entity Registrant Name FIDUS INVESTMENT CORPORATION    
Entity Central Index Key 0001513363    
Current Fiscal Year End Date --12-31    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Common Stock, Shares Outstanding   24,842,692  
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity File Number 814-00861    
Entity Tax Identification Number 27-5017321    
Entity Address, Address Line One 1603 Orrington Avenue, Suite 1005    
Entity Address, City or Town Evanston    
Entity Address, State or Province IL    
Entity Address, Postal Zip Code 60201    
City Area Code 847    
Local Phone Number 859-3940    
ICFR Auditor Attestation Flag false    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Shell Company false    
Title of 12(b) Security Common Stock, par value $0.001 per share    
Security Exchange Name NASDAQ    
Entity Incorporation, State or Country Code MD    
Document Annual Report true    
Document Transition Report false    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s proxy statement to be filed with the U.S. Securities and Exchange Commission pursuant to Regulation 14A in connection with the registrant’s 2023 Annual Meeting of Stockholders, which will be filed subsequent to the date hereof, are incorporated by reference into Part III of this Form 10-K. Such proxy statement will be filed with the U.S. Securities and Exchange Commission not later than 120 days following the end of the registrant’s fiscal year ended December 31, 2022.

    
Entity Public Float     $ 420,357,517
Auditor Firm ID 49    
Auditor Name RSM US LLP    
Auditor Location Chicago, Illinois