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Commitments and Contingencies - Additional Information (Details) - USD ($)
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Commitments And Contingencies Disclosure [Line Items]    
Commitments to fund investments $ 150,600,000 $ 166,900,000
Maximum    
Commitments And Contingencies Disclosure [Line Items]    
Unfunded commitments $ 28,400,000 $ 42,000,000.0