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Fair Value of Financial Instruments - Summary of Unobservable Inputs and Ranges (Details) - Level 3 $ in Thousands | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($)
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Fair value | $ 1,104,927 | $ 1,021,189
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 | $ 167,563 | $ 218,851
Range of Input | 0.025 | 0.021
Equity | Enterprise Market Value | EBITDA Multiple |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Fair value | $ 89,906 | $ 70,253
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 | 0.033 | 0.047
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 | 0.214 | 0.185
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 | (0.125) | (0.115)
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 | $ 5,232 | $ 7,569
Range of Input | 0.118 | 0.093
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 | $ 70,363 | $ 177,480
First lien | Market Comparable | Market Yield |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Fair value | $ 930,806 | $ 754,004
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 | 0.056
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 | 0.21 | 0.130
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 | (0.109) | (0.075)
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 | $ 2,934
Range of Input | 0.140 |
First lien | Long-Term Credit Facility | Enterprise Market Value | EBITDA Multiple |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Range of Input |  | 0.018
Second lien | Market Comparable | Market Yield |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Fair value | $ 147 | $ 8,085
Range of Input | 0.00147 |
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 |  | 0.110
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 |  | 0.140
Second 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 |  | (0.118)
Second lien | Enterprise Market Value | EBITDA Multiple |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Fair value |  | $ 864
Range of Input | 0.060 | 0.054

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=SL6742756-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 35 -Paragraph 54B -URI https://asc.fasb.org/extlink&oid=126972413&loc=SL7495116-110257 + Details
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- Definition Value of input used to measure alternative investment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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