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Fair Value of Financial Instruments - Summary of Unobservable Inputs and Ranges (Details) - Level 3
$ in Thousands
Jun. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value $ 2,341,829 $ 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 $ 298,865 $ 443,880
Range of Input 0.054 [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 $ 11,933  
Range of Input [1] 0.172  
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] 0.063  
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] 0.233  
Subordinated Debt | Enterprise Market Value | EBITDA Multiple    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value $ 573  
Range of Input [1] 0.148  
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 $ 89,907 $ 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 $ 2,037,892 $ 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 0.082 [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 0.206 [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 0.102 [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] 0.009  
First lien | Enterprise Market Value | EBITDA Multiple    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value $ 19,460 $ 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] 0.07  
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] 0.085  
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] 0.075  
First lien | Enterprise Market Value | Revenue Multiple    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Fair value $ 3,342  
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 $ 178,722 $ 168,450
Range of Input [1] 0.111  
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 0.015 [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 0.163 [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.