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Fair Value Measurements - Schedule of Investments that Use Level 3 Inputs (Details) - Level 3 [Member] - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Schedule of Investments that Use Level 3 Inputs [Line Items] |  |
Balance at beginning | $ 140,290 | $ 165,316
Purchases and other adjustments to cost | 121,928 | 34,450
Sales (including repayments or maturities) | (31,092) | (53,752)
Net realized gains/(losses) from investments | (1,388) | (1,472)
Net unrealized gains/(losses) | (326) | 5,995
Transfer in/(out) |  |
Balance at ending | 229,412 | 150,537
Senior Secured First Lien Term Loans [Member] |  |
Schedule of Investments that Use Level 3 Inputs [Line Items] |  |
Balance at beginning | 68,987 | 82,499
Purchases and other adjustments to cost | 46,455 | 14,352
Sales (including repayments or maturities) | (19,625) | (30,946)
Net realized gains/(losses) from investments | (1,388) | (8,676)
Net unrealized gains/(losses) | 1,410 | 22,752
Transfer in/(out) |  |
Balance at ending | 95,839 | 79,981
Senior Secured Notes [Member] |  |
Schedule of Investments that Use Level 3 Inputs [Line Items] |  |
Balance at beginning | 7,422 |
Purchases and other adjustments to cost |  |
Sales (including repayments or maturities) |  |
Net realized gains/(losses) from investments |  |
Net unrealized gains/(losses) |  |
Balance at ending | 7,422 |
Equities/ Warrants [Member] |  |
Schedule of Investments that Use Level 3 Inputs [Line Items] |  |
Balance at beginning | 63,881 | 82,817
Purchases and other adjustments to cost | 75,473 | 20,098
Sales (including repayments or maturities) | (11,467) | (22,806)
Net realized gains/(losses) from investments |  | 7,204
Net unrealized gains/(losses) | (1,736) | (16,757)
Transfer in/(out) |  |
Balance at ending | $ 126,151 | $ 70,556

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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://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2G -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2G Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of sales 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://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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