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Fair Value of Financial Instruments - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Net unrealized appreciation (depreciation) on the Credit Facility	$ 48,301	$ 13,174	$ 27,499
Long-Term Credit Facility
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Line of credit facility amendment costs	3,300	6,500	0
Prior Credit Facility
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Net change in unrealized appreciation (depreciation)	0	0	$ (2,300)
Net unrealized appreciation (depreciation) on the Credit Facility	$ 0	$ 0

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