Fair Value Measurements (Details) - Schedule of Quantitative Information About Level 3 Fair Value Measurements of Our Investments - Level 3 [Member] - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Jun. 30, 2024	Sep. 30, 2023
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 141,385	$ 165,316
Senior Secured First Lien Term Loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 59,588	$ 69,943
Valuation Methodology	Income Approach	Income Approach
Unobservable Input	Market Yield	Market Yield
Range (Weighted Average)	42.50%	32.00%
Impact to Valuation From An Increase In Input	Decrease	Decrease
Senior Secured First Lien Term Loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 7,062	$ 751
Valuation Methodology	Recent Purchase	Market Approach
Unobservable Input	Purchase Price	Revenue Multiple
Range (Weighted Average)		0.30%
Impact to Valuation From An Increase In Input		Increase
Senior Secured First Lien Term Loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 4,245	$ 10,939
Valuation Methodology	Market Approach	Market Approach
Unobservable Input	EBITDA Multiple	EBITDA Multiple
Range (Weighted Average)	8.30%	5.00%
Impact to Valuation From An Increase In Input	Increase	Increase
Senior Secured First Lien Term Loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 350	$ 866
Valuation Methodology	Cost Approach	Market Approach
Unobservable Input	Collateral Value	LTM EBITDA Multiple
Range (Weighted Average)		6.80%
Impact to Valuation From An Increase In Input		Increase
Senior Secured Notes [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 10,422
Valuation Methodology	Recent Purchase
Unobservable Input	Purchase Price
Range (Weighted Average)
Impact to Valuation From An Increase In Input
Equity/Warrants [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 34,708	$ 38,870
Valuation Methodology	Cost Approach	Cost Approach
Unobservable Input	Collateral Value	Collateral Value
Range (Weighted Average)
Impact to Valuation From An Increase In Input
Equity/Warrants [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 24,812	$ 22,007
Valuation Methodology	Market Approach	Market Approach
Unobservable Input	EBITDA Multiple	EBITDA Multiple
Range (Weighted Average)	10.80%	36.80%
Impact to Valuation From An Increase In Input	Increase	Increase
Equity/Warrants [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 100	$ 206
Valuation Methodology	Recent Purchase	Income Approach
Unobservable Input	Purchase Price	DLOM (Discount for lack of Marketability)
Range (Weighted Average)		3.20%
Impact to Valuation From An Increase In Input		Decrease
Equity/Warrants [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 98	$ 10,000
Valuation Methodology	Income Approach	Recent Purchase
Unobservable Input	DLOM (Discount for lack of Marketability)	Purchase Price
Range (Weighted Average)	31.00%
Impact to Valuation From An Increase In Input	Decrease
Equity/Warrants [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value		$ 11,734
Valuation Methodology		Market Approach
Unobservable Input		LTM Multiple
Range (Weighted Average)		6.80%
Impact to Valuation From An Increase In Input		Increase
Minimum [Member] \| Senior Secured First Lien Term Loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range (Weighted Average)	3.30%	8.50%
Minimum [Member] \| Senior Secured First Lien Term Loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range (Weighted Average)		0.30%
Minimum [Member] \| Senior Secured First Lien Term Loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range (Weighted Average)	3.30%	1.70%
Minimum [Member] \| Senior Secured First Lien Term Loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range (Weighted Average)		5.80%
Minimum [Member] \| Equity/Warrants [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range (Weighted Average)	1.00%	1.80%
Minimum [Member] \| Equity/Warrants [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range (Weighted Average)		3.00%
Minimum [Member] \| Equity/Warrants [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range (Weighted Average)	26.00%
Minimum [Member] \| Equity/Warrants [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range (Weighted Average)		5.80%
Maximum [Member] \| Senior Secured First Lien Term Loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range (Weighted Average)	(16.90%)	(13.78%)
Maximum [Member] \| Senior Secured First Lien Term Loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range (Weighted Average)		0.30%
Maximum [Member] \| Senior Secured First Lien Term Loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range (Weighted Average)	4.70%	3.10%
Maximum [Member] \| Senior Secured First Lien Term Loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range (Weighted Average)		6.30%
Maximum [Member] \| Equity/Warrants [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range (Weighted Average)	8.70%	2.80%
Maximum [Member] \| Equity/Warrants [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range (Weighted Average)		3.10%
Maximum [Member] \| Equity/Warrants [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range (Weighted Average)	(28.50%)
Maximum [Member] \| Equity/Warrants [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Range (Weighted Average)		6.30%

Fair Value Measurement Inputs and Valuation Techniques [Line Items]