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Fair Value of Financial Instruments - Summary of Unobservable Inputs and Ranges (Details) - Level 3 $ in Thousands | Mar. 31, 2025 USD ($) | Sep. 30, 2024 USD ($)
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Fair value |  | $ 2,275,788 |  | $ 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 |  | $ 273,790 |  | $ 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 |  | $ 3,880 |  |  |
Range of Input | [1] | 0.207 |  |  |
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] | 0.232 |  |  |
Subordinated Debt | Enterprise Market Value | EBITDA Multiple |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Fair value |  | $ 504 |  |  |
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 |  | $ 112,768 |  | $ 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 |  | $ 1,948,508 |  | $ 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 |  | 0.085 | [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 |  | 0.211 | [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] | 0.003 |  |  |
First lien | Enterprise Market Value | EBITDA Multiple |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Fair value |  | $ 29,218 |  | $ 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] | 0.06 |  |  |
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] | 0.084 |  |  |
First lien | Enterprise Market Value | Revenue Multiple |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Fair value |  | $ 9,679 |  |  |
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] | 0.006 |  |  |
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 |  | $ 171,231 |  | $ 168,450 |
Range of Input | [1] | 0.113 |  |  |
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.

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