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Fair Value of Financial Instruments - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Long-Term Credit Facility
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Line of credit facility amendment costs	$ 0.0	$ 0.0	$ 2.9
Net change in unrealized (appreciation) depreciation on debt	(2.3)	(4.9)	$ (11.6)
Prior Credit Facility
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Net change in unrealized depreciation on debt	$ 0.0	$ (1.5)