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Fair Value of Financial Instruments - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2022
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Net change in unrealized depreciation on debt			$ (4,842,000)	$ 1,273,000
Long-Term Credit Facility
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Line of credit facility amendment costs	$ 0	$ 0	0	0
Net change in unrealized(depreciation ) appreciation on debt	$ (5,800,000)	$ (100,000)	(4,800,000)	$ (1,300,000)
Prior Credit Facility
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Net change in unrealized depreciation on debt			$ 2,600,000		$ (1,500,000)