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Fair Value of Financial Instruments - Summary of Unobservable Inputs and Ranges (Details) - Level 3 $ in Thousands | Jun. 30, 2025 USD ($) | Sep. 30, 2024 USD ($)
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Fair value |  | $ 2,341,829 |  | $ 1,917,839 |
Long-Term Credit Facility | Market Comparable | Market Yield |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Fair value |  | $ 298,865 |  | $ 443,880 |
Range of Input |  | 0.054 | [1] | 0.054 | [2]
Subordinated Debt | Market Comparable | Market Yield |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Fair value |  | $ 11,933 |  |  |
Range of Input | [1] | 0.172 |  |  |
Subordinated Debt | Market Comparable | Market Yield | Minimum |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Range of Input | [1] | 0.063 |  |  |
Subordinated Debt | Market Comparable | Market Yield | Maximum |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Range of Input | [1] | 0.233 |  |  |
Subordinated Debt | Enterprise Market Value | EBITDA Multiple |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Fair value |  | $ 573 |  |  |
Range of Input | [1] | 0.148 |  |  |
First lien | Market Comparable | Broker/Dealer Bids or Quotes |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Fair value |  | $ 89,907 |  | $ 132,197 |
First lien | Market Comparable | Market Yield |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Fair value |  | $ 2,037,892 |  | $ 1,589,437 |
First lien | Market Comparable | Market Yield | Minimum |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Range of Input |  | 0.082 | [1] | 0.079 | [2]
First lien | Market Comparable | Market Yield | Maximum |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Range of Input |  | 0.206 | [1] | 0.211 | [2]
First lien | Market Comparable | Market Yield | Weighted Average |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Range of Input |  | 0.102 | [1] | 0.091 | [2]
First lien | Market Comparable | EBITDA Multiple | Minimum |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Range of Input | [2] |  |  | 0.008 |
First lien | Market Comparable | EBITDA Multiple | Maximum |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Range of Input | [2] |  |  | 0.098 |
First lien | Market Comparable | EBITDA Multiple | Weighted Average |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Range of Input | [2] |  |  | 0.034 |
First lien | Market Comparable | Revenue Multiple |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Range of Input | [1] | 0.009 |  |  |
First lien | Enterprise Market Value | EBITDA Multiple |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Fair value |  | $ 19,460 |  | $ 25,063 |
First lien | Enterprise Market Value | EBITDA Multiple | Minimum |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Range of Input | [1] | 0.07 |  |  |
First lien | Enterprise Market Value | EBITDA Multiple | Maximum |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Range of Input | [1] | 0.085 |  |  |
First lien | Enterprise Market Value | EBITDA Multiple | Weighted Average |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Range of Input | [1] | 0.075 |  |  |
First lien | Enterprise Market Value | Revenue Multiple |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Fair value |  | $ 3,342 |  |  |
Second lien | Market Comparable | Market Yield |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Fair value |  |  |  | $ 2,688 |
Range of Input | [2] |  |  | 0.14 |
Second lien | Market Comparable | Market Yield | Minimum |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Range of Input | [2] |  |  | 0.118 |
Second lien | Market Comparable | Market Yield | Maximum |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Range of Input | [2] |  |  | 0.165 |
Second lien | Enterprise Market Value | EBITDA Multiple |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Fair value |  |  |  | $ 4 |
Range of Input | [2] |  |  | 0.05 |
Equity | Enterprise Market Value | EBITDA Multiple |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Fair value |  | $ 178,722 |  | $ 168,450 |
Range of Input | [1] | 0.111 |  |  |
Equity | Enterprise Market Value | EBITDA Multiple | Minimum |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Range of Input |  | 0.015 | [1] | 0.004 | [2]
Equity | Enterprise Market Value | EBITDA Multiple | Maximum |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Range of Input |  | 0.163 | [1] | 0.188 | [2]
Equity | Enterprise Market Value | EBITDA Multiple | Weighted Average |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Range of Input | [2] |  |  | 0.11 |
[1] | The weighted averages disclosed in the table above were weighted by their relative fair value.
[2] | The weighted averages disclosed in the table above were weighted by their relative fair value.

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- Definition Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 107 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-107 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 103 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-103 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 35 -Paragraph 54B -Publisher FASB -URI https://asc.fasb.org/1943274/2147482134/820-10-35-54B Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A + Details
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