v3.25.4

Fair Value of Financial Instruments - Summary of Investments, Cash and Cash Equivalents, Credit Facility, SBA Debentures and Notes (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | $ 1,287,273 |  | $ 1,328,050 |
Cash and cash equivalents, Fair Value |  | 51,783 |  | 49,861 |
Total investments and cash and cash equivalents |  | 1,339,056 |  | 1,377,911 |
Credit Facility, Fair Value |  | 425,477 |  | 460,361 |
Total debt |  | 738,883 |  | 772,012 |
2026 Notes |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt |  | 149,473 | [1] | 148,571 | [2]
2026 Notes-2 |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt |  | 163,933 | [1] | 163,080 | [2]
Debt Investments |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | 801,754 |  | 916,796 |
U.S. Government Securities |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | 124,788 | [3] | 99,632 | [4]
Equity Investments |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | 360,731 |  | 311,622 |
Level 1 |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and cash equivalents, Fair Value |  | 51,783 |  | 49,861 |
Total investments and cash and cash equivalents |  | 51,783 |  | 49,861 |
Level 2 |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | 124,788 |  | 99,632 |
Total investments and cash and cash equivalents |  | 124,788 |  | 99,632 |
Total debt |  | 313,406 |  | 311,651 |
Level 2 | 2026 Notes |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt |  | 149,473 | [1] | 148,571 | [2]
Level 2 | 2026 Notes-2 |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt |  | 163,933 | [1] | 163,080 | [2]
Level 2 | U.S. Government Securities |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments | [4] | 124,788 | [3] | 99,632 |
Level 3 |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | 1,087,964 |  | 1,152,369 |
Total investments and cash and cash equivalents |  | 1,087,964 |  | 1,152,369 |
Credit Facility, Fair Value |  | 425,477 |  | 460,361 |
Total debt |  | 425,477 |  | 460,361 |
Level 3 | 2026 Notes |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt | [1] | 0 |  |  |
Level 3 | 2026 Notes-2 |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt | [1] | 0 |  |  |
Level 3 | Debt Investments |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | 801,754 |  | 916,796 |
Level 3 | U.S. Government Securities |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments | [3] | 0 |  |  |
Level 3 | Equity Investments |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | 286,210 |  | 235,573 |
Measured at Net Asset Value |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | 74,521 | [5] | 76,049 | [6]
Total investments and cash and cash equivalents |  | 74,521 | [5] | 76,049 | [6]
Measured at Net Asset Value | Equity Investments |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |
Total investments |  | $ 74,521 | [5] | $ 76,049 | [6]
[1] | We elected not to apply ASC 825-10 to the 2026 Notes, and the 2026 Notes-2 and thus the balance reported in the Consolidated Statement of Assets and Liabilities represents the carrying value.
[2] | We elected not to apply ASC 825-10 to the 2026 Notes, and the 2026 Notes-2 and thus the balance reported in the Consolidated Statement of Assets and Liabilities represents the carrying value.
[3] | Our U.S. Treasury Bills are classified as Level 2, as they were valued by the pricing service who utilize broker-supplied prices.
[4] | Our U.S. Treasury Bills are classified as Level 2, as they were valued by the pricing service who utilize broker-supplied prices.
[5] | In accordance with ASC Subtopic 820-10, Fair Value Measurements and Disclosures, or ASC 820-10, our equity investment in PSLF and PTSF II is measured using the 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.
[6] | In accordance with ASC Subtopic 820-10, Fair Value Measurements and Disclosures, or ASC 820-10, our equity investment in PSLF and PTSF II is measured using the 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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