v3.26.1
Fair Value Measurements - Schedule of Quantitative Information about the Significant Unobservable Inputs (Details)
$ in Thousands
Mar. 31, 2026
USD ($)
Sep. 30, 2025
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value $ 397,083 [1] $ 390,128 [2]
Equity    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value 7,078 7,095
Level 3 | Senior secured loans | Valuation Technique, Yield Analysis And Price Of Comparable Business    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value $ 22,940 $ 16,647
Level 3 | Senior secured loans | Minimum | Market interest rate | Yield analysis    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment company, investment owned, measurement input 0.078 0.078
Level 3 | Senior secured loans | Minimum | EBITDA multiples | Market comparable companies    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment company, investment owned, measurement input 5.0 6.0
Level 3 | Senior secured loans | Maximum | Market interest rate | Yield analysis    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment company, investment owned, measurement input 0.093 0.090
Level 3 | Senior secured loans | Maximum | EBITDA multiples | Market comparable companies    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment company, investment owned, measurement input 20.5 20.0
Level 3 | Senior secured loans | Weighted Average | Market interest rate | Yield analysis    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment company, investment owned, measurement input 0.081 0.084
Level 3 | Senior secured loans | Weighted Average | EBITDA multiples | Market comparable companies    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment company, investment owned, measurement input 10.4 10.3
Level 3 | One stop loans | Valuation Technique, Yield Analysis And Price Of Comparable Business    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value $ 360,922 $ 359,911
Level 3 | One stop loans | Market comparable companies    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value 410 11
Level 3 | One stop loans | Broker/dealer bids or quotes    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value 5,228 5,176
Level 3 | One stop loans | EBITDA multiples | Valuation Technique, Yield Analysis And Price Of Comparable Business    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value 309,239 306,160
Level 3 | One stop loans | Revenue multiples | Valuation Technique, Yield Analysis And Price Of Comparable Business    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value $ 51,683 $ 53,751
Level 3 | One stop loans | Minimum | Market interest rate | Yield analysis    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment company, investment owned, measurement input 0.035 0.038
Level 3 | One stop loans | Minimum | EBITDA multiples | Market comparable companies    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment company, investment owned, measurement input 7.3 8.0
Level 3 | One stop loans | Minimum | Revenue multiples | Market comparable companies    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment company, investment owned, measurement input 1.5 2.0
Level 3 | One stop loans | Maximum | Market interest rate | Yield analysis    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment company, investment owned, measurement input 0.205 0.205
Level 3 | One stop loans | Maximum | EBITDA multiples | Market comparable companies    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment company, investment owned, measurement input 29.5 33.0
Level 3 | One stop loans | Maximum | Revenue multiples | Market comparable companies    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment company, investment owned, measurement input 14.5 15.0
Level 3 | One stop loans | Weighted Average | Market interest rate | Yield analysis    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment company, investment owned, measurement input 0.089 0.087
Level 3 | One stop loans | Weighted Average | EBITDA multiples | Market comparable companies    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment company, investment owned, measurement input 14.9 15.5
Level 3 | One stop loans | Weighted Average | Revenue multiples | Market comparable companies    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment company, investment owned, measurement input 8.3 9.4
Level 3 | Subordinated debt and second lien loans | Valuation Technique, Yield Analysis And Price Of Comparable Business    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value $ 915 $ 1,299
Level 3 | Subordinated debt and second lien loans | Market comparable companies    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value   $ 66
Level 3 | Subordinated debt and second lien loans | Minimum | Market interest rate | Yield analysis    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment company, investment owned, measurement input 0.128 0.118
Level 3 | Subordinated debt and second lien loans | Minimum | EBITDA multiples | Market comparable companies    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment company, investment owned, measurement input 9.5 9.5
Level 3 | Subordinated debt and second lien loans | Maximum | Market interest rate | Yield analysis    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment company, investment owned, measurement input 0.130 0.150
Level 3 | Subordinated debt and second lien loans | Maximum | EBITDA multiples | Market comparable companies    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment company, investment owned, measurement input 11.0 24.0
Level 3 | Subordinated debt and second lien loans | Weighted Average | Market interest rate | Yield analysis    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment company, investment owned, measurement input 0.130 0.121
Level 3 | Subordinated debt and second lien loans | Weighted Average | EBITDA multiples | Market comparable companies    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment company, investment owned, measurement input 10.9 12.7
Level 3 | Equity    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value $ 7,078 $ 7,095
Level 3 | Equity | Market comparable companies    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value 7,078 7,095
Level 3 | Equity | EBITDA multiples | Market comparable companies    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value 5,905 5,703
Level 3 | Equity | Revenue multiples | Market comparable companies    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value $ 1,173 $ 1,392
Level 3 | Equity | Minimum | EBITDA multiples | Market comparable companies    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment company, investment owned, measurement input 7.3 8.0
Level 3 | Equity | Minimum | Revenue multiples | Market comparable companies    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment company, investment owned, measurement input 1.5 2.0
Level 3 | Equity | Maximum | EBITDA multiples | Market comparable companies    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment company, investment owned, measurement input 26.0 28.0
Level 3 | Equity | Maximum | Revenue multiples | Market comparable companies    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment company, investment owned, measurement input 14.5 15
Level 3 | Equity | Weighted Average | EBITDA multiples | Market comparable companies    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment company, investment owned, measurement input 15.4 16.2
Level 3 | Equity | Weighted Average | Revenue multiples | Market comparable companies    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment company, investment owned, measurement input 10.9 11.5
[1] The fair values of investments were valued using significant unobservable inputs, unless otherwise noted. See Note 7. The fair value of loan investments may include the impact of the unfunded commitment being valued below par.
[2] The fair values of investments were valued using significant unobservable inputs, unless otherwise noted. See Note 7. The fair value of loan investments may include the impact of the unfunded commitment being valued below par.