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Investments - Schedule of Investments and Cash and Cash Equivalents (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |
Cash and cash equivalents | $ 102,730 | $ 112,050
Cost |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |
Cash and cash equivalents | 102,726 | 112,046
Total investments and cash and cash equivalents | 2,557,536 | 2,106,986
Cost | First lien |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |
Total investments | 1,930,158 | 1,521,496
Cost | First lien in PSSL |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |
Total investments | 237,650 | 237,650
Cost | Subordinate debt |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |
Total investments | 12,032 | 2,632
Cost | Equity |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |
Total investments | 151,245 | 131,312
Cost | Equity interests in PSSL |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |
Total investments | 123,725 | 101,850
Fair Value |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |
Cash and cash equivalents | 102,730 | 112,050
Total investments and cash and cash equivalents | 2,506,245 | 2,095,554
Fair Value | First lien |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |
Total investments | 1,912,951 | 1,509,048
Fair Value | First lien in PSSL |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |
Total investments | 237,650 | 237,650
Fair Value | Subordinate debt |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |
Total investments | 12,506 | 2,693
Fair Value | Equity |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |
Total investments | 187,119 | 177,635
Fair Value | Equity interests in PSSL |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |
Total investments | 53,289 | 56,478
Total Investments [Member] | Cost |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |
Total investments | 2,454,810 | 1,994,940
Total Investments [Member] | Fair Value |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |
Total investments | $ 2,403,515 | $ 1,983,504

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483467/210-10-45-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-4 + Details
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