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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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- Definition

Amount of realized gain (loss) recognized in income for derivative asset (liability) after deduction of derivative liability (asset), measured at fair value using unobservable input (level 3) and still held.

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Amount of unrealized gain (loss) recognized in income for derivative asset (liability) after deduction of derivative liability (asset), measured at fair value using unobservable input (level 3) and still held.

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Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy.

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