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Fair Value of Financial Instruments - Summary of Unobservable Inputs and Ranges (Details) - Level 3 $ in Thousands | Jun. 30, 2023 USD ($) | Sep. 30, 2022 USD ($)
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Fair value |  | $ 1,048,422 |  | $ 1,104,927 |
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 |  | $ 63,917 |  | $ 167,563 |
Range of Input |  | 0.025 | [1] | 0.025 | [2]
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 |  | $ 52,268 |  | $ 70,363 |
First lien | Market Comparable | Market Yield |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Fair value |  | $ 897,976 |  | $ 930,806 |
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 |  | 0.088 | [1] | 0.082 | [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 |  | 0.185 | [1] | 0.21 | [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 |  | 0.116 | [1] | 0.109 | [2]
First lien | Enterprise Market Value | EBITDA Multiple |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Fair value |  |  |  | $ 8,473 |
Range of Input | [2] |  |  | 0.14 |
Second lien | Market Comparable | Market Yield |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Fair value |  | $ 149 |  | $ 147 |
Range of Input |  | 0.142 | [1] | 0.147 | [2]
Equity | Enterprise Market Value | EBITDA Multiple |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Fair value |  | $ 97,211 |  | $ 89,906 |
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 |  | 0.03 | [1] | 0.033 | [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 |  | 0.188 | [1] | 0.214 | [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 |  | 0.119 | [1] | 0.125 | [2]
Equity | Enterprise Market Value | Discount for Lack of Marketability |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |  |  |
Fair value |  | $ 818 |  | $ 5,232 |
Range of Input |  | 0.217 | [1],[3] | 0.118 | [2],[4]
[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.
[3] | DLOM is defined as discount for lack of marketability.
[4] | DLOM is defined as discount for lack of marketability.

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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/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 2: 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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- Definition Value of input used to measure alternative investment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 + Details
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