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Change in Net Assets from Operations Per Common Share - Summary of Information Sets Forth for Computation of Basic and Diluted Per Share Net Increase in Net Assets Resulting from Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Numerator for net increase in net assets resulting from operations	$ 3,453	$ 56,516	$ 18,413
Denominator for basic and diluted weighted average shares	41,060,541	38,776,831	38,772,074
Basic and diluted net increase in net assets per share resulting from operations	$ 0.08	$ 1.46	$ 0.47	$ 0.29	$ 0.87

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Investment company basic and diluted weighted average shares.

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- Definition

Per share or unit amount of investment income (loss) and realized and unrealized gain (loss) on investment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 205
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=25866437&loc=d3e10246-115837

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Amount of increase (decrease) in net assets from operations of investment company.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 205
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