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Fair Value of Financial Instruments - Summary of Unobservable Inputs and Ranges (Details) - Level 3
$ in Thousands
Dec. 31, 2024
USD ($)
Sep. 30, 2024
USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value $ 2,136,080 $ 1,917,839
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 $ 608,791 $ 443,880
Range of Input 0.058 [1] 0.054 [2]
Subordinated Debt | Market Comparable | Market Yield    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value $ 2,826  
Range of Input [1] 0.20  
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] 0.053  
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] 0.232  
Subordinated Debt | Enterprise Market Value | EBITDA Multiple    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value $ 609  
Range of Input [1] 0.15  
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 $ 107,391 $ 132,197
First lien | Market Comparable | Market Yield    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value $ 1,833,348 $ 1,589,437
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 0.065 [1] 0.079 [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 0.21 [1] 0.211 [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 0.104 [1] 0.091 [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]   0.008
First lien | Market Comparable | EBITDA Multiple | Maximum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range of Input [2]   0.098
First lien | Market Comparable | EBITDA Multiple | Weighted Average    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range of Input [2]   0.034
First lien | Market Comparable | Revenue Multiple    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range of Input [1] 0.007  
First lien | Enterprise Market Value | EBITDA Multiple    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value $ 7,262 $ 25,063
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] 0.08  
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] 0.105  
First lien | 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 [1] 0.103  
First lien | Enterprise Market Value | Revenue Multiple    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value $ 15,775  
First lien | Enterprise Market Value | Revenue Multiple | Maximum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range of Input [1] 0.01  
First lien | Enterprise Market Value | Revenue Multiple | Weighted Average    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Range of Input [1] 0.008  
Second lien | Market Comparable | Market Yield    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value   $ 2,688
Range of Input [2]   0.14
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]   0.118
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]   0.165
Second lien | Enterprise Market Value | EBITDA Multiple    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value   $ 4
Range of Input [2]   0.05
Equity | Enterprise Market Value | EBITDA Multiple    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value $ 168,869 $ 168,450
Range of Input [1] 0.12  
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 0.018 [1] 0.004 [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] 0.188 [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]   0.11
[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.