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Fair Value of Financial Instruments - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Sep. 30, 2022
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Net change in unrealized depreciation on debt			$ 909,000	$ 1,247,000
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	$ (1,200,000)	$ (2,400,000)	900,000	$ 1,200,000
Prior Credit Facility
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Net change in unrealized depreciation on debt			$ 3,200,000		$ 1,500,000