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Fair Value of Financial Instruments - Summary of Unobservable Inputs and Ranges (Details) - Level 3 $ in Thousands		Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair value		$ 1,006,948	$ 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		$ 85,619	$ 167,563
Range of Input	[1]	0.023	0.025
Equity | Enterprise Market Value | EBITDA Multiple
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair value		$ 100,489	$ 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	[1]	0.034	0.033
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	[1]	0.077	0.214
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	[1]	0.121	0.125
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		$ 144	$ 5,232
Range of Input	[1]	0.279	0.118
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		$ 25,521	$ 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		$ 875,133	$ 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	[1]	0.10	0.082
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	[1]	0.25	0.21
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	[1]	0.126	0.109
First lien | Enterprise Market Value | EBITDA Multiple
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair value		$ 5,512	$ 8,473
Range of Input	[1]		0.14
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]	0.028
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]	0.075
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]	0.074
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	[1]	0.148	0.147
Second lien | Enterprise Market Value | EBITDA Multiple
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair value		$ 0	$ 0
Range of Input	[1]	0.06	0.06
[1] 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/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

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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)
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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