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Borrowings (Details) - Schedule of Consolidated Statements of Assets and Liabilities - Level 1 [Member] - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Borrowings (Details) - Schedule of Consolidated Statements of Assets and Liabilities [Line Items] |  |
Total debt issuance costs at beginning of period | $ 2,059 | $ 5,413
Amortized debt issuance costs | 370 | 3,354
Unamortized debt issuance costs | 1,689 | 2,059
2023 Notes [Member] |  |
Borrowings (Details) - Schedule of Consolidated Statements of Assets and Liabilities [Line Items] |  |
Total debt issuance costs at beginning of period | 39 | 3,102
Amortized debt issuance costs | 39 | 3,063
Unamortized debt issuance costs |  | 39
2028 Notes [Member] |  |
Borrowings (Details) - Schedule of Consolidated Statements of Assets and Liabilities [Line Items] |  |
Total debt issuance costs at beginning of period | 2,020 | 2,311
Amortized debt issuance costs | 331 | 291
Unamortized debt issuance costs | $ 1,689 | $ 2,020

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- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1F -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1F Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482925/835-30-45-3 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
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