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Fair Value of Financial Instruments - Summary of Unobservable Inputs and Ranges (Details) - Level 3
$ in Thousands
Dec. 31, 2025
USD ($)
Sep. 30, 2025
USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value $ 2,515,800 $ 2,729,010
Long-Term Credit Facility | Market Comparable | Market Yield    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value $ 488,859 $ 683,837
Range of Input 0.053 [1] 0.048 [2]
Subordinated Debt | Market Comparable | Market Yield    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value $ 18,610  
Range of Input [1] 0.177  
Subordinated Debt | Market Comparable | Market Yield | Minimum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range of Input [1] 0.014  
Subordinated Debt | Market Comparable | Market Yield | Maximum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range of Input [1] 0.253  
Subordinated Debt | Enterprise Market Value | EBITDA Multiple    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value $ 539  
Range of Input [1] 0.145  
First lien | Market Comparable | Broker/Dealer Bids or Quotes    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value $ 105,885 $ 114,625
First lien | Market Comparable | Market Yield    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value $ 2,185,345 $ 2,377,201
First lien | Market Comparable | Market Yield | Minimum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range of Input 0.04 [1] 0.04 [2]
First lien | Market Comparable | Market Yield | Maximum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range of Input 0.273 [1] 0.245 [2]
First lien | Market Comparable | Market Yield | Weighted Average    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range of Input 0.101 [1] 0.099 [2]
First lien | Market Comparable | EBITDA Multiple | Minimum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range of Input [2]   0.083
First lien | Market Comparable | Revenue Multiple    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value   $ 3,836
Range of Input [1] 0.003  
First lien | Market Comparable | Revenue Multiple | Minimum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range of Input [2]   0.006
First lien | Enterprise Market Value | EBITDA Multiple    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value $ 18,160 $ 17,969
Range of Input [1] 0.077  
First lien | Enterprise Market Value | EBITDA Multiple | Minimum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range of Input [1] 0.075  
First lien | Enterprise Market Value | EBITDA Multiple | Maximum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range of Input [1] 0.08  
First lien | Enterprise Market Value | Revenue Multiple    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value $ 852  
Second lien | Market Comparable | Broker/Dealer Bids or Quotes    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value 995 995
Second lien | Market Comparable | Market Yield    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value   $ 17,439
Range of Input [2]   0.171
Second lien | Market Comparable | Market Yield | Minimum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range of Input [2]   0.07
Second lien | Market Comparable | Market Yield | Maximum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range of Input [2]   0.254
Second lien | Enterprise Market Value | EBITDA Multiple    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value   $ 547
Range of Input [2]   0.148
Equity | Enterprise Market Value | EBITDA Multiple    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value $ 185,414 $ 196,398
Range of Input [1] 0.11  
Equity | Enterprise Market Value | EBITDA Multiple | Minimum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range of Input 0.003 [1] 0.006 [2]
Equity | Enterprise Market Value | EBITDA Multiple | Maximum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range of Input 0.168 [1] 0.283 [2]
Equity | Enterprise Market Value | EBITDA Multiple | Weighted Average    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range of Input [2]   0.108
[1] The weighted averages disclosed in the table above were weighted by their relative fair value.
[2] The weighted averages disclosed in the table above were weighted by their relative fair value.