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Fair Value of Financial Instruments - Summary of Investments, Cash and Cash Equivalents, Credit Facility, or Prior Credit Facility, Notes and Asset Backed Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Sep. 30, 2025
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | $ 2,605,347 |  | $ 2,773,328 |
Cash and cash equivalents |  | 40,143 |  | 40,729 |
Total investments and cash and cash equivalents |  | 2,645,490 |  | 2,814,057 |
Long Term Credit Facility payable |  | 488,859 |  | 683,837 |
Total debt |  | 1,632,010 |  | 1,776,770 |
2026 Notes Payable |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt |  | 184,803 | [1] | 184,609 | [2]
2036 Asset-Backed Debt |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt |  | 284,762 | [1] | 284,627 | [2]
2036 R Asset-Backed Debt |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt |  | 286,561 | [1] | 265,366 | [2]
2037 Asset-Backed Debt |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt |  | 387,025 | [1] | 358,331 | [2]
First lien |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | 2,310,242 |  | 2,513,631 |
Second lien |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | 20,144 |  | 18,981 |
Equity |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | 274,961 |  | 240,716 |
Level 1 |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | 0 |  | 0 |
Cash and cash equivalents |  | 40,143 |  | 40,729 |
Total investments and cash and cash equivalents |  | 40,143 |  | 40,729 |
Long Term Credit Facility payable |  | 0 |  |  |
Total debt |  | 0 |  | 0 |
Level 1 | 2026 Notes Payable |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt | [2] | 0 |  | 0 |
Level 1 | 2036 Asset-Backed Debt |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt | [2] | 0 |  | 0 |
Level 1 | 2036 R Asset-Backed Debt |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt | [2] | 0 |  | 0 |
Level 1 | 2037 Asset-Backed Debt |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt | [1] | 0 |  |  |
Level 1 | First lien |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | 0 |  | 0 |
Level 1 | Second lien |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  |  |  | 0 |
Level 1 | Subordinate debt |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | 0 |  |  |
Level 1 | Equity |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | 0 |  | 0 |
Level 2 |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | 0 |  | 0 |
Cash and cash equivalents |  | 0 |  | 0 |
Total investments and cash and cash equivalents |  | 0 |  | 0 |
Long Term Credit Facility payable |  | 0 |  | 0 |
Total debt |  | 184,803 |  | 184,609 |
Level 2 | 2026 Notes Payable |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt | [2] | 184,803 |  | 184,609 |
Level 2 | 2036 Asset-Backed Debt |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt | [2] | 0 |  | 0 |
Level 2 | 2036 R Asset-Backed Debt |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt | [2] | 0 |  | 0 |
Level 2 | 2037 Asset-Backed Debt |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt | [1] | 0 |  |  |
Level 2 | First lien |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | 0 |  | 0 |
Level 2 | Second lien |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  |  |  | 0 |
Level 2 | Subordinate debt |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | 0 |  |  |
Level 2 | Equity |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | 0 |  | 0 |
Level 3 |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | 2,515,800 |  | 2,729,010 |
Cash and cash equivalents |  | 0 |  | 0 |
Total investments and cash and cash equivalents |  | 2,515,800 |  | 2,729,010 |
Long Term Credit Facility payable |  | 488,859 |  | 683,837 |
Total debt |  | 1,447,207 |  | 1,592,161 |
Level 3 | 2026 Notes Payable |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt |  | 0 | [1] | 0 | [2]
Level 3 | 2036 Asset-Backed Debt |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt |  | 284,762 | [1] | 284,627 | [2]
Level 3 | 2036 R Asset-Backed Debt |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt |  | 286,561 | [1] | 265,366 | [2]
Level 3 | 2037 Asset-Backed Debt |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt |  | 387,025 | [1] | 358,331 | [2]
Level 3 | First lien |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | 2,310,242 |  | 2,513,631 |
Level 3 | Second lien |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | 20,144 |  | 18,981 |
Level 3 | Equity |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | 185,414 |  | 196,398 |
Measured at Net Asset Value |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments | [3] | 89,547 |  | 44,318 | [4]
Cash and cash equivalents | [3] | 0 |  | 0 | [4]
Total investments and cash and cash equivalents | [3] | 89,547 |  | 44,318 | [4]
Long Term Credit Facility payable | [3],[4] |  |  | 0 |
Total debt | [3] | 0 |  | 0 | [4]
Measured at Net Asset Value | 2026 Notes Payable |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt | [2],[3] | 0 |  | 0 |
Measured at Net Asset Value | 2036 Asset-Backed Debt |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt | [2],[3] | 0 |  | 0 |
Measured at Net Asset Value | 2036 R Asset-Backed Debt |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt | [2],[3] | 0 |  | 0 |
Measured at Net Asset Value | 2037 Asset-Backed Debt |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt | [1],[2],[3] | 0 |  |  |
Measured at Net Asset Value | First lien |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments | [3] | 0 |  | 0 | [4]
Measured at Net Asset Value | Second lien |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments | [3],[4] |  |  | 0 |
Measured at Net Asset Value | Subordinate debt |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments | [3] | 0 |  |  |
Measured at Net Asset Value | Equity |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments | [3] | $ 89,547 |  | $ 44,318 | [4]
[1] | We elected not to apply the fair value option allowed by ASC 825-10 to the 2026 Notes, 2036 Asset-Backed Debt, the 2036-R Asset-Backed Debt, and the 2037 Asset-Backed Debt and thus the balance reported in the Consolidated Statement of Assets and Liabilities represents the carrying value, which approximates the fair value.
[2] | We elected not to apply the fair value option allowed by ASC 825-10 to the 2026 Notes, 2036 Asset-Backed Debt, 2036-R Asset-Backed Debt, and 2037 Asset-Backed Debt and thus the balance reported in the Consolidated Statement of Assets and Liabilities represents the carrying value, which approximates the fair value.
[3] | In accordance with ASC Subtopic 820-10, Fair Value Measurements and Disclosures, or ASC 820-10, our equity investments in PSSL and PSSL II are measured using net asset value per share (or its equivalent) as a practical expedient for fair value, and thus have not been classified in the fair value hierarchy.
[4] | In accordance with ASC Subtopic 820-10, Fair Value Measurements and Disclosures, or ASC 820-10, our equity investments in PSSL is measured using net asset value per share (or its equivalent) as a practical expedient for fair value in accordance with the specialized accounting guidance for investment companies, and thus has not been classified in the fair value hierarchy.

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