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COMMITMENTS AND CONTINGENCIES - Schedule of Principal Balances of Unused Line of Credit and Delayed Draw Term Debt Commitments and Guaranties (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Sep. 30, 2022
Other Commitments [Line Items] |  |
Total | $ 58,167 | $ 74,846
Unused line of credit commitments |  |
Other Commitments [Line Items] |  |
Total | 31,337 | 36,225
Delayed draw term loans |  |
Other Commitments [Line Items] |  |
Total | 25,987 | 37,778
Uncalled capital commitment |  |
Other Commitments [Line Items] |  |
Total | $ 843 | $ 843

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- Definition Amount of funds committed to investment company from investors. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 205 -Section 50 -Paragraph 25 -URI https://asc.fasb.org/extlink&oid=25866437&loc=d3e10491-115837 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Period Type: |