Federal Income Tax Matters - Schedule of Reclassification Taxable Income (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Schedule of Investments [Abstract]
Increase (decrease) in Paid in Capital in Excess of Par	$ (12,902)	$ (750)	$ (1,425)
Increase (decrease) in Distributable Earnings (Losses)	$ 12,902	$ 750	$ 1,425

Amount of decrease in additional paid in capital (APIC) resulting from dividends legally declared (or paid) in excess of retained earnings balance.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-SubTopic 10
-Topic 505
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-2

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration