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Commitments and Contingencies - Additional Information (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Mar. 31, 2024
Sep. 30, 2023
Commitments And Contingencies Disclosure [Line Items]    
Commitments to fund investments $ 300.2 $ 155.5
Maximum    
Commitments And Contingencies Disclosure [Line Items]    
Unfunded commitments $ 39.4 $ 39.4