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Cover - USD ($)
 12 Months Ended
Sep. 30, 2025
Dec. 11, 2025
Mar. 31, 2025
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Financial Statement Error Correction [Flag] false    
Entity Interactive Data Current Yes    
ICFR Auditor Attestation Flag false    
Amendment Flag false    
Document Period End Date Sep. 30, 2025    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Documents Incorporated by Reference [Text Block]

Portions of the registrant’s proxy statement to be filed with the Securities and Exchange Commission pursuant to Regulation 14A in connection with the registrant’s 2026 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 Securities and Exchange Commission not later than 120 days following the end of the registrant’s fiscal year ended September 30, 2025.

    
Entity Information [Line Items]      
Entity Registrant Name PHENIXFIN CORPORATION    
Entity Central Index Key 0001490349    
Securities Act File Number 1-35040    
Entity Tax Identification Number 27-4576073    
Entity Incorporation, State or Country Code DE    
Current Fiscal Year End Date --09-30    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Shell Company false    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Public Float     $ 81,346,226
Entity Contact Personnel [Line Items]      
Entity Address, Address Line One 445 Park Avenue    
Entity Address, Address Line Two 10th Floor    
Entity Address, City or Town New York    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10022    
Entity Phone Fax Numbers [Line Items]      
City Area Code (212)    
Local Phone Number 859-0390    
Entity Listings [Line Items]      
Entity Common Stock, Shares Outstanding   2,000,560  
Common Stock, par value $0.001 per share      
Entity Listings [Line Items]      
Title of 12(b) Security Common Stock, par value $0.001 per share    
Trading Symbol PFX    
Security Exchange Name NASDAQ    
5.25% Notes due 2028      
Entity Listings [Line Items]      
Title of 12(b) Security 5.25% Notes due 2028    
Trading Symbol PFXNZ    
Security Exchange Name NASDAQ