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Fair Value of Financial Instruments - Summary of Unobservable Inputs and Ranges (Details) - Level 3 $ in Thousands | Jun. 30, 2024 USD ($) | Sep. 30, 2023 USD ($)
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Fair value |  | $ 1,590,101 |  | $ 1,006,948 |
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 |  | $ 218,862 |  | $ 85,619 |
Range of Input |  | 0.02 | [1] | 0.023 | [2]
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] | 0.15 |  |  |
Subordinated Debt | Enterprise Market Value | EBITDA Multiple |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Fair value |  | $ 1,003 |  |  |
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 |  | 56,443 |  | $ 25,521 |
First lien | Market Comparable | Market Yield |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Fair value |  | $ 1,386,217 |  | $ 875,133 |
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 |  | 0.064 | [1] | 0.10 | [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] | 0.25 | [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] | 0.126 | [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 |  | 0.08 | [1] | 0.028 | [2]
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] |  |  | 0.075 |
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] |  |  | 0.074 |
First lien | Enterprise Market Value | EBITDA Multiple |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Fair value |  | $ 6,546 |  | $ 5,512 |
Second lien | Market Comparable | Market Yield |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Fair value |  | $ 150 |  | $ 149 |
Range of Input |  | 0.144 | [1] | 0.148 | [2]
Second lien | Enterprise Market Value | EBITDA Multiple |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Fair value |  |  |  | $ 0 |
Range of Input | [2] |  |  | 0.06 |
Equity | Enterprise Market Value | EBITDA Multiple |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Fair value |  | $ 139,743 |  | $ 100,489 |
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 |  | 0.035 | [1] | 0.034 | [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 |  | 0.218 | [1] | 0.177 | [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 |  | 0.114 | [1] | 0.121 | [2]
Equity | Enterprise Market Value | Discount for Lack of Marketability |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Fair value |  |  |  | $ 144 |
Range of Input | [2] |  |  | 0.279 |
[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.

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