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Fair Value of Financial Instruments - Summary of Unobservable Inputs and Ranges (Details) - Level 3 $ in Thousands | Dec. 31, 2025 USD ($) | Sep. 30, 2025 USD ($)
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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.

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