Fair Value Measurements (Details) - Schedule of quantitative information about level 3 fair value measurements of our investments - Level 3 [Member] - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Mar. 31, 2023	Sep. 30, 2022
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 151,266	$ 146,675
Senior Secured First Lien Term Loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 73,166	$ 65,428
Valuation Methodology	Market Approach	Income Approach
Unobservable Input	Market Yield	Market Yield
Range (Weighted Average)	8.50% - 30.0% (13.11%)	8.50% - 24.00% (10.57%)
Senior Secured First Lien Term Loans One [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 5,199	$ 3,807
Valuation Methodology	Market Approach	Market Approach
Unobservable Input	Revenue Multiple	EBITDA Multiple
Range (Weighted Average)	0.26x - 0.31x (0.3x)	4.0x - 5.0x (4.5x)
Senior Secured First Lien Term Loans Two [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 3,925	$ 4,152
Valuation Methodology	Market Approach	Market Approach
Unobservable Input	EBITDA Multiple	Revenue Multiple
Range (Weighted Average)	4.0x - 5.00x (4.5x)	0.2x - 0.3x (2.5x)
Senior Secured First Lien Term Loans Three [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 869	$ 865
Valuation Methodology	Market Approach	Income Approach
Unobservable Input	LTM EBITDA Multiple	Market Spread
Range (Weighted Average)	6.5x - 7.5x (7.0x)	5.75% - 6.25% (6.00%)
Equity/Warrants [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 38,051	$ 47,138
Valuation Methodology	Cost Approach	Cost Approach
Unobservable Input	Replacement Cost	Replacement Cost
Range (Weighted Average)	N/A
Equity/Warrants One [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 11,151	$ 11,444
Valuation Methodology	Income Approach	Market Approach
Unobservable Input	Market Yield	EBITDA Multiple
Range (Weighted Average)	0% - 13.50% (5.89%)	2.0x - 21.0x (17.4x)
Equity/Warrants Two [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 10,291	$ 9,951
Valuation Methodology	Market Approach	Income Approach
Unobservable Input	LTM Multiple	Market Yield
Range (Weighted Average)	6.5x - 7.5x (7.0x)	8.50% - 13.25% (12.75%)
Equity/Warrants Three [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 6,454	$ 1,283
Valuation Methodology	Market Approach	Market Approach
Unobservable Input	EBITDA Multiple	Sum of the Parts/Estimated Proceeds
Range (Weighted Average)	0% - 38.6x (2.87x)	8.1x - 11.4x (9.8x)
Equity/Warrants Four [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 923
Valuation Methodology	Market Approach
Unobservable Input	Sum of the Parts/Estimated proceeds
Range (Weighted Average)	6.3x - 7.0x (6.6x)
Equity/Warrants Five [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 210
Valuation Methodology	Income Approach
Unobservable Input	DLOM (Discount for lack of Marketability)
Range (Weighted Average)	2.9x - 3.2x (3.1x)
Fund Investment [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 1,027
Valuation Methodology	Cost Approach
Unobservable Input	Transaction
Range (Weighted Average)	N/A
Senior Secured First Lien Term Loans Four [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value		$ 2,607
Valuation Methodology		Market Approach
Unobservable Input		EBITDA Multiple
Range (Weighted Average)		9.0x - 10.0x (9.5x)