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Fair Value Measurements (Details) - Schedule of Investments that Use Level 3 Inputs - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance at beginning |  | $ 146,675 | $ 115,813 |
Purchases and other adjustments to cost |  | 53,052 | 130,290 |
Sales (including repayments or maturities) |  | (48,851) | (112,551) |
Net realized gains/(losses) from investments |  | (9,398) | 12,085 |
Net unrealized gains/(losses) |  | 23,838 | 838 |
Transfer in/(out) |  |  | 200 |
Balance at ending |  | 165,316 | 146,675 |
Level 3 [Member] | Senior Secured First Lien Term Loans [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance at beginning |  | 74,252 | 61,934 |
Purchases and other adjustments to cost |  | 23,481 | 59,179 |
Sales (including repayments or maturities) |  | (12,840) | (58,333) |
Net realized gains/(losses) from investments |  | 162 | (23,917) |
Net unrealized gains/(losses) |  | (2,556) | 35,189 |
Transfer in/(out) |  |  | 200 |
Balance at ending |  | 82,499 | 74,252 |
Level 3 [Member] | Senior Secured Second Lien Term Loans [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance at beginning |  | 2,607 | 2,490 |
Purchases and other adjustments to cost |  |  |  |
Sales (including repayments or maturities) |  | (2,607) |  |
Net realized gains/(losses) from investments |  | 5 |  |
Net unrealized gains/(losses) |  | (5) | 117 |
Transfer in/(out) |  |  |  |
Balance at ending |  |  | 2,607 |
Level 3 [Member] | Unsecured Debt [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance at beginning |  |  |  |
Purchases and other adjustments to cost |  |  |  |
Sales (including repayments or maturities) |  | (191) | (1,280) |
Net realized gains/(losses) from investments |  | 9 | (99) |
Net unrealized gains/(losses) |  | 182 | 1,379 |
Transfer in/(out) |  |  |  |
Balance at ending |  |  |  |
Level 3 [Member] | Equities/ Warrants [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance at beginning | [1] | 69,816 | 48,889 |
Purchases and other adjustments to cost |  | 29,571 | 71,111 | [1]
Sales (including repayments or maturities) |  | (33,213) | (52,938) | [1]
Net realized gains/(losses) from investments |  | (9,574) | 36,101 | [1]
Net unrealized gains/(losses) |  | 26,217 | (33,347) | [1]
Transfer in/(out) | [1] |  |  |
Balance at ending |  | 82,817 | 69,816 | [1]
Level 3 [Member] | Secured Debt [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance at beginning |  |  | 2,500 |
Purchases and other adjustments to cost |  |  |  |
Sales (including repayments or maturities) |  |  |  |
Net realized gains/(losses) from investments |  |  |  |
Net unrealized gains/(losses) | [1] |  | (2,500) |
Transfer in/(out) |  |  |  |
Balance at ending |  |  |  |
[1] | FlexFIN, LLC was reclassed as an Equity from Secured Debt during the quarter ended December 31, 2021.

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