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Significant Accounting Policies - Additional Information (Details) $ in Thousands | 12 Months Ended
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Sep. 30, 2024 USD ($) Portfolio | Sep. 30, 2023 USD ($) Portfolio | Sep. 30, 2022 USD ($)
Significant Accounting Policies [Line Items] |  |  |
Provision for taxes | $ 1,100 | $ 1,000 | $ 400
Due to affiliates | (566) | (3,042) | 3,383
Deferred tax liability | 1,700 | 1,800 |
Net provision for taxes on realized gain on investments | 45 | 263 | 0
Provision for taxes on unrealized appreciation (depreciation) on investments | (100) | (2,800) |
Provision for taxes on net realized gain on investments | 0 | 0 | $ 1,200
State and local tax liability | 0 |  |
Taxable Subsidiary [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Net provision for taxes on realized gain on investments | $ 100 | $ 300 |
Past Due 30 Days or More |  |  |
Significant Accounting Policies [Line Items] |  |  |
Financing receivable, nonaccrual, percent past due on cost basis | 0.40% | 0.90% |
Financing receivable, nonaccrual, percent past due on fair value basis | 0.20% | 0.20% |
Number of portfolio on nonaccrual | Portfolio | 2 | 3 |

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- Definition Amount of current state and local tax expense (benefit) attributable to income (loss) from continuing operations. Includes, but is not limited to, current regional, territorial, and provincial tax expense (benefit) for non-US (United States of America) jurisdiction. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479360/740-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(1)(Note 1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -SubTopic 10 -Topic 740 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-9 + Details
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