Commitments and Contingencies (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Sep. 30, 2022
Loss Contingencies [Line Items]
Investment company, financial commitment to investee, future amount	$ 185,380	$ 224,581
Undrawn Revolver
Loss Contingencies [Line Items]
Investment company, financial commitment to investee, future amount	$ 30,511	$ 35,643

Amount of financial support to be provided in future by investment company to investee.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=66023616&loc=SL35737436-115832

Name:	us-gaap_InvestmentCompanyFinancialCommitmentToInvesteeFutureAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant