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Fair Value of Financial Instruments - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Sep. 30, 2022
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |
Net change in unrealized depreciation on debt |  |  | $ (4,842,000) | $ 1,273,000 |
Long-Term Credit Facility |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |
Line of credit facility amendment costs | $ 0 | $ 0 | 0 | 0 |
Net change in unrealized(depreciation ) appreciation on debt | $ (5,800,000) | $ (100,000) | (4,800,000) | $ (1,300,000) |
Prior Credit Facility |  |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |  |
Net change in unrealized depreciation on debt |  |  | $ 2,600,000 |  | $ (1,500,000)

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