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Transactions with Affiliated Companies - Summary of Transactions with Affiliated Companies (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Investments In And Advances To Affiliates [Line Items]
Net Realized Gains (Losses)	$ (11,106)	$ (12,796)	$ (12,682)
Non-controlled, Affiliated Investments
Investments In And Advances To Affiliates [Line Items]
Fair Value		7,433
Sale of/ Distribution from Affiliates	(22,380)
Net Change in Unrealized Appreciation (Depreciation)	14,947
Interest Income	112
Net Realized Gains (Losses)	(22,315)
Non-controlled, Affiliated Investments \| DBI Holding, LLC
Investments In And Advances To Affiliates [Line Items]
Fair Value		7,433
Sale of/ Distribution from Affiliates	(22,380)
Net Change in Unrealized Appreciation (Depreciation)	14,947
Interest Income	112
Net Realized Gains (Losses)	(22,380)
Non-controlled, Affiliated Investments \| Country Fresh Holding Company Inc.
Investments In And Advances To Affiliates [Line Items]
Net Realized Gains (Losses)	65
Controlled, Affiliated Investments
Investments In And Advances To Affiliates [Line Items]
Fair Value	271,005	217,380
Gross Additions	71,074
Net Change in Unrealized Appreciation (Depreciation)	(17,450)
Interest Income	16,724
Dividend/Other Income	13,650
Controlled, Affiliated Investments \| Marketplace Events, LLC
Investments In And Advances To Affiliates [Line Items]
Fair Value	31,390	31,649
Gross Additions	636
Net Change in Unrealized Appreciation (Depreciation)	(895)
Interest Income	1,439
Controlled, Affiliated Investments \| Loan Fund I LLC
Investments In And Advances To Affiliates [Line Items]
Fair Value	239,615	185,731
Gross Additions	70,438
Net Change in Unrealized Appreciation (Depreciation)	(16,554)
Interest Income	15,285
Dividend/Other Income	13,650
Controlled and Non-Controlled Affiliates
Investments In And Advances To Affiliates [Line Items]
Fair Value	271,005	$ 224,813
Gross Additions	71,074
Sale of/ Distribution from Affiliates	(22,380)
Net Change in Unrealized Appreciation (Depreciation)	(2,503)
Interest Income	16,836
Dividend/Other Income	13,650
Net Realized Gains (Losses)	$ (22,315)