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INVESTMENTS - Fair Value Measurement Inputs and Valuation Techniques (Details) $ in Thousands | Mar. 31, 2023 USD ($) | Sep. 30, 2022 USD ($)
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Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments owned, fair value | $ 678,759 | $ 649,615
B. Riley Financial, Inc. |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments owned, fair value | 2,300 |
Leeds Acquisition Holdings, LLC |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments owned, fair value | 200 | 6,400
Funko Acquisition Holdings, LLC |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments owned, fair value | 27,000 | 58
Significant Unobservable Inputs (Level 3) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments owned, fair value | 676,163 | 643,160
Significant Unobservable Inputs (Level 3) | Yield Analysis | Secured first lien debt |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments owned, fair value | 458,476 | 423,912
Significant Unobservable Inputs (Level 3) | Yield Analysis | Secured second lien debt |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments owned, fair value | $ 99,773 | $ 97,472
Significant Unobservable Inputs (Level 3) | Yield Analysis | Discount Rate | Secured first lien debt | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value, measurement input | 0.110 | 0.080
Significant Unobservable Inputs (Level 3) | Yield Analysis | Discount Rate | Secured first lien debt | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value, measurement input | 0.257 | 0.295
Significant Unobservable Inputs (Level 3) | Yield Analysis | Discount Rate | Secured first lien debt | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value, measurement input | 0.137 | 0.118
Significant Unobservable Inputs (Level 3) | Yield Analysis | Discount Rate | Secured second lien debt | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value, measurement input | 0.113 | 0.115
Significant Unobservable Inputs (Level 3) | Yield Analysis | Discount Rate | Secured second lien debt | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value, measurement input | 0.153 | 0.154
Significant Unobservable Inputs (Level 3) | Yield Analysis | Discount Rate | Secured second lien debt | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value, measurement input | 0.142 | 0.138
Significant Unobservable Inputs (Level 3) | TEV | Secured first lien debt |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments owned, fair value | $ 40,471 | $ 39,946
Significant Unobservable Inputs (Level 3) | TEV | Secured second lien debt |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments owned, fair value | 7,505 | 7,665
Significant Unobservable Inputs (Level 3) | TEV | Unsecured debt |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments owned, fair value | 36 | 55
Significant Unobservable Inputs (Level 3) | TEV | Preferred and common equity / equivalents |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments owned, fair value | $ 59,742 | $ 63,319
Significant Unobservable Inputs (Level 3) | TEV | EBITDA multiple | Secured first lien debt | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value, measurement input | 4.6 | 4.8
Significant Unobservable Inputs (Level 3) | TEV | EBITDA multiple | Secured first lien debt | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value, measurement input | 6.4 | 6.7
Significant Unobservable Inputs (Level 3) | TEV | EBITDA multiple | Secured first lien debt | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value, measurement input | 6 | 6.2
Significant Unobservable Inputs (Level 3) | TEV | EBITDA multiple | Secured second lien debt | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value, measurement input | 5.5 | 5.6
Significant Unobservable Inputs (Level 3) | TEV | EBITDA multiple | Secured second lien debt | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value, measurement input | 5.5 | 5.6
Significant Unobservable Inputs (Level 3) | TEV | EBITDA multiple | Secured second lien debt | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value, measurement input | 5.5 | 5.6
Significant Unobservable Inputs (Level 3) | TEV | EBITDA multiple | Preferred and common equity / equivalents | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value, measurement input | 4.4 | 4.1
Significant Unobservable Inputs (Level 3) | TEV | EBITDA multiple | Preferred and common equity / equivalents | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value, measurement input | 12.9 | 11
Significant Unobservable Inputs (Level 3) | TEV | EBITDA multiple | Preferred and common equity / equivalents | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value, measurement input | 6.4 | 6.5
Significant Unobservable Inputs (Level 3) | TEV | EBITDA | Secured first lien debt | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments owned, fair value | $ 963 | $ 800
Significant Unobservable Inputs (Level 3) | TEV | EBITDA | Secured first lien debt | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments owned, fair value | 13,215 | 10,257
Significant Unobservable Inputs (Level 3) | TEV | EBITDA | Secured first lien debt | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments owned, fair value | 9,251 | 7,605
Significant Unobservable Inputs (Level 3) | TEV | EBITDA | Secured second lien debt | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments owned, fair value | 3,095 | 3,299
Significant Unobservable Inputs (Level 3) | TEV | EBITDA | Secured second lien debt | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments owned, fair value | 3,095 | 3,299
Significant Unobservable Inputs (Level 3) | TEV | EBITDA | Secured second lien debt | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments owned, fair value | 3,095 | 3,299
Significant Unobservable Inputs (Level 3) | TEV | EBITDA | Preferred and common equity / equivalents | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments owned, fair value | 963 | 800
Significant Unobservable Inputs (Level 3) | TEV | EBITDA | Preferred and common equity / equivalents | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments owned, fair value | 91,580 | 74,512
Significant Unobservable Inputs (Level 3) | TEV | EBITDA | Preferred and common equity / equivalents | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments owned, fair value | $ 9,806 | $ 11,742
Significant Unobservable Inputs (Level 3) | TEV | Revenue multiple | Secured first lien debt | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value, measurement input | 0.3 | 0.3
Significant Unobservable Inputs (Level 3) | TEV | Revenue multiple | Secured first lien debt | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value, measurement input | 0.6 | 0.6
Significant Unobservable Inputs (Level 3) | TEV | Revenue multiple | Secured first lien debt | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value, measurement input | 0.4 | 0.5
Significant Unobservable Inputs (Level 3) | TEV | Revenue multiple | Unsecured debt | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value, measurement input | 1.3 | 0.3
Significant Unobservable Inputs (Level 3) | TEV | Revenue multiple | Unsecured debt | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value, measurement input | 1.3 | 1.3
Significant Unobservable Inputs (Level 3) | TEV | Revenue multiple | Unsecured debt | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value, measurement input | 1.3 | 1
Significant Unobservable Inputs (Level 3) | TEV | Revenue multiple | Preferred and common equity / equivalents | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value, measurement input | 0.3 | 0.3
Significant Unobservable Inputs (Level 3) | TEV | Revenue multiple | Preferred and common equity / equivalents | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value, measurement input | 3 | 4.4
Significant Unobservable Inputs (Level 3) | TEV | Revenue multiple | Preferred and common equity / equivalents | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value, measurement input | 1.3 | 1.4
Significant Unobservable Inputs (Level 3) | TEV | Revenue | Secured first lien debt | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments owned, fair value | $ 14,300 | $ 11,514
Significant Unobservable Inputs (Level 3) | TEV | Revenue | Secured first lien debt | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments owned, fair value | 15,483 | 16,320
Significant Unobservable Inputs (Level 3) | TEV | Revenue | Secured first lien debt | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments owned, fair value | 15,033 | 14,656
Significant Unobservable Inputs (Level 3) | TEV | Revenue | Unsecured debt | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments owned, fair value | 5,778 | 764
Significant Unobservable Inputs (Level 3) | TEV | Revenue | Unsecured debt | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments owned, fair value | 5,778 | 11,514
Significant Unobservable Inputs (Level 3) | TEV | Revenue | Unsecured debt | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments owned, fair value | 5,778 | 4,249
Significant Unobservable Inputs (Level 3) | TEV | Revenue | Preferred and common equity / equivalents | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments owned, fair value | 3,162 | 764
Significant Unobservable Inputs (Level 3) | TEV | Revenue | Preferred and common equity / equivalents | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments owned, fair value | 15,483 | 42,926
Significant Unobservable Inputs (Level 3) | TEV | Revenue | Preferred and common equity / equivalents | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments owned, fair value | 14,115 | 19,963
Significant Unobservable Inputs (Level 3) | Market Quote | Secured second lien debt |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Investments owned, fair value | $ 10,160 | $ 10,791
Significant Unobservable Inputs (Level 3) | Market Quote | IBP | Secured second lien debt | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value, measurement input | 0.635 | 0.820
Significant Unobservable Inputs (Level 3) | Market Quote | IBP | Secured second lien debt | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value, measurement input | 0.985 | 0.950
Significant Unobservable Inputs (Level 3) | Market Quote | IBP | Secured second lien debt | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value, measurement input | 0.814 | 0.865

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- Definition Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 50 -Paragraph 6 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 5D -Subparagraph (SX 210.12-13D(Column C)) -URI https://asc.fasb.org/extlink&oid=122147990&loc=SL120429264-123010 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column C)) -URI https://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010 + Details
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