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Fair Value Measurements (Details) - Schedule of Investments That Use Level 3 Inputs - USD ($) $ in Thousands		9 Months Ended
		Jun. 30, 2023	Jun. 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		41,632	99,582
Sales (including repayments or maturities)		(33,751)	(96,423)
Net realized gains/(losses) from investments		(816)	14,765
Net unrealized gains/(losses)		9,477	(6,610)
Transfer in/(out)			(5,248)
Balance at ending		163,217	121,879
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		22,722	44,145
Sales (including repayments or maturities)		(7,256)	(47,936)
Net realized gains/(losses) from investments		105	(21,737)
Net unrealized gains/(losses)		(3,698)	27,398
Transfer in/(out)			(5,248)
Balance at ending		86,125	58,556
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)	111
Transfer in/(out)
Balance at ending			2,601
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)		(30)	(1,280)
Net realized gains/(losses) from investments		1	(99)
Net unrealized gains/(losses)		190	1,379
Transfer in/(out)
Balance at ending		161
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		17,883	55,437
Sales (including repayments or maturities)		(23,858)	(47,207)
Net realized gains/(losses) from investments		(927)	36,601
Net unrealized gains/(losses)		13,055	(32,998)	[1]
Transfer in/(out)
Balance at ending		75,969	60,722
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)		(65)
Transfer in/(out)
Balance at ending		$ 962
Level 3 [Member] | Unsecured 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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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 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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