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Fair Value Measurements (Details) - Schedule of investments that use level 3 inputs - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
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 |  | 7,184 | 65,973 |
Sales |  | (18,297) | (73,343) |
Net realized gains/(losses) from investments |  | 8 | 14,295 |
Net unrealized gains/(losses) |  | (1,888) | (14,288) |
Transfer in/(out) |  | 1,659 |  |
Balance at ending |  | 135,341 | 108,450 |
Senior Secured First Lien Term Loans [Member] | Level 3 [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 |  | 2,900 | 27,629 |
Sales |  | (1,046) | (32,951) |
Net realized gains/(losses) from investments |  | 3 | (21,759) |
Net unrealized gains/(losses) |  | (1,448) | 20,453 |
Transfer in/(out) |  |  |  |
Balance at ending |  | 74,661 | 55,306 |
Senior Secured Second Lien Term Loans [Member] | Level 3 [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 |  | (2,607) |  |
Net realized gains/(losses) from investments |  | 5 |  |
Net unrealized gains/(losses) |  | (5) | 3 |
Transfer in/(out) |  |  |  |
Balance at ending |  |  | 2,493 |
Equities/ Warrants [Member] | Level 3 [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 |  | 4,282 | 38,344 |
Sales |  | (14,644) | (40,292) |
Net realized gains/(losses) from investments |  |  | 36,153 |
Net unrealized gains/(losses) |  | (391) | (32,443) | [1]
Transfer in/(out) |  |  |  |
Balance at ending |  | 59,063 | 50,651 |
Senior Secured Notes [Member] | Level 3 [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Purchases and other adjustments to cost |  |  |  |
Sales |  |  |  |
Net realized gains/(losses) from investments |  |  |  |
Net unrealized gains/(losses) |  | (42) |  |
Transfer in/(out) |  | 1,659 |  |
Balance at ending |  | $ 1,617 |  |
Secured Debt [Member] | Level 3 [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 |  |  |  |
Net realized gains/(losses) from investments |  |  |  |
Net unrealized gains/(losses) | [1] |  | (2,500) |
Balance at ending |  |  |  |
Unsecured Debt [Member] | Level 3 [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance at beginning |  |  |  |
Purchases and other adjustments to cost |  |  |  |
Sales |  |  | (100) |
Net realized gains/(losses) from investments |  |  | (99) |
Net unrealized gains/(losses) |  |  | 199 |
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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