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Commitments and Contingencies - Additional Information (Details) - USD ($)
 6 Months Ended 12 Months Ended
Mar. 31, 2023
Sep. 30, 2022
Commitments And Contingencies Disclosure [Line Items]    
Commitments to fund investments $ 157,900,000 $ 150,600,000
Maximum    
Commitments And Contingencies Disclosure [Line Items]    
Unfunded commitments $ 0 $ 28,400,000