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Fair Value Measurements (Details) - Schedule of investments that use level 3 inputs - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 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 |  | 25,193 | 83,109 |
Sales (including repayments or maturities) |  | (24,305) | (84,014) |
Net realized gains/(losses) from investments |  | (837) | 14,758 |
Net unrealized gains/(losses) |  | 4,540 | (4,307) |
Transfer in/(out) |  |  | (5,248) |
Balance at ending |  | 151,266 | 120,111 |
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 |  | 15,443 | 44,145 |
Sales (including repayments or maturities) |  | (3,657) | (36,095) |
Net realized gains/(losses) from investments |  | 85 | (21,744) |
Net unrealized gains/(losses) |  | (2,964) | 29,368 |
Transfer in/(out) |  |  | (5,248) |
Balance at ending |  | 83,159 | 72,360 |
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) | (3) |
Transfer in/(out) |  |  |  |
Balance at ending |  |  | 2,487 |
Level 3 [Member] | Equities/ Warrants [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance at beginning |  | 69,816 | 48,889 |
Purchases and other adjustments to cost |  | 8,723 | 38,964 |
Sales (including repayments or maturities) |  | (18,041) | (46,639) |
Net realized gains/(losses) from investments |  | (927) | 36,601 |
Net unrealized gains/(losses) |  | 7,509 | (32,551) | [1]
Transfer in/(out) |  |  |  |
Balance at ending |  | 67,080 | 45,264 |
Level 3 [Member] | Fund Investment [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance at beginning |  |  |  |
Purchases and other adjustments to cost |  | 1,027 |  |
Sales (including repayments or maturities) |  |  |  |
Net realized gains/(losses) from investments |  |  |  |
Net unrealized gains/(losses) |  |  |  |
Transfer in/(out) |  |  |  |
Balance at ending |  | $ 1,027 |  |
Level 3 [Member] | Senior Secured Notes [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 |  |  |  |
Level 3 [Member] | Unsecured Debt [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Purchases and other adjustments to cost |  |  |  |
Sales (including repayments or maturities) |  |  | (1,280) |
Net realized gains/(losses) from investments |  |  | (99) |
Net unrealized gains/(losses) |  |  | 1,379 |
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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