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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2024
Mar. 04, 2025
Jun. 30, 2024
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2024    
Document Fiscal Year Focus 2024    
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 Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Common Stock, Shares Outstanding   33,914,652  
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    
Document Financial Statement Error Correction 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 2025 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, 2024.

    
Entity Public Float     $ 639,199,110
Auditor Firm ID 49    
Auditor Name RSM US LLP    
Auditor Location Chicago, Illinois    
Auditor Opinion

Opinion on the Financial Statements

We have audited the accompanying consolidated statements of assets and liabilities of Fidus Investment Corporation and Subsidiaries (the Company), including the consolidated schedules of investments, as of December 31, 2024 and 2023, the related consolidated statements of operations, changes in net assets, and cash flows for each of the three years in the period ended December 31, 2024, and the related notes, which include the senior securities table, to the consolidated financial statements (collectively, the financial statements). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2024 and 2023, and the results of its operations, changes in net assets, and cash flows for each of the three years in the period ended December 31, 2024, in conformity with accounting principles generally accepted in the United States of America.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company's internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission in 2013, and our report dated March 6, 2025, expressed an unqualified opinion on the effectiveness of the Company’s internal control over financial reporting.