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BORROWINGS - Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2022
Debt Instrument [Line Items] |  |  |
Line of credit at fair value (Cost of $108,400 and $141,800, respectively) | $ 108,400 |  | $ 141,800
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring |  |  |
Debt Instrument [Line Items] |  |  |
Line of credit at fair value (Cost of $108,400 and $141,800, respectively) | 108,400 |  | $ 141,800
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Long-Term Debt |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |
Beginning balance | 141,800 | $ 50,500 |
Borrowings | 14,800 | 138,200 |
Repayments | (48,200) | (134,800) |
Net unrealized appreciation | 0 | 0 |
Ending balance | $ 108,400 | $ 53,900 |

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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Unrealized Appreciation (Depreciation) + References No definition available. + Details
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- Definition Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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