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Fair Value of Financial Instruments - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Long-Term Credit Facility      
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]      
Line of credit facility amendment costs $ 0.4 $ 2.9 $ 0.0
Net change in unrealized (appreciation) depreciation on debt (4.9) (11.6) $ 14.2
Prior Credit Facility      
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]      
Net change in unrealized depreciation on debt $ 1.5 $ 7.2