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Transactions with Affiliated Companies - Summary of Transactions with Affiliated Companies (Details) - USD ($) $ in Thousands | 12 Months Ended
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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) |  |

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