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Fair Value of Financial Instruments - Summary of Unobservable Inputs and Ranges (Details) - Level 3
$ in Thousands

Mar. 31, 2024

USD ($)

Sep. 30, 2023

USD ($)

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]

Fair value

$ 1,415,066

$ 1,006,948

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

$ 168,878

$ 85,619

Range of Input

0.021

^[1]

0.023

^[2]

Subordinated Debt [Member] | Market Comparable | Market Yield

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]

Fair value

$ 18

Range of Input

^[1]

0.151

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

$ 51,970

$ 25,521

First lien | Market Comparable | Market Yield

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]

Fair value

$ 1,227,231

$ 875,133

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

0.084

^[1]

0.10

^[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

0.24

^[1]

0.25

^[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

0.112

^[1]

0.126

^[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]

0.028

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]

0.075

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]

0.074

First lien | Enterprise Market Value | EBITDA Multiple

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]

Fair value

$ 5,706

$ 5,512

Range of Input

^[1]

0.093

Second lien | Market Comparable | Market Yield

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]

Fair value

$ 150

$ 149

Range of Input

0.145

^[1]

0.148

^[2]

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

Range of Input

^[2]

0.06

Equity | Enterprise Market Value | EBITDA Multiple

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]

Fair value

$ 129,991

$ 100,489

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

0.035

^[1]

0.034

^[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

0.183

^[1]

0.177

^[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

0.122

^[1]

0.121

^[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

$ 144

Range of Input

^[2]

0.279

[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.

X

- 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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X

- 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

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+ References

No definition available.

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