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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2023 | Sep. 30, 2022
Commitments And Contingencies Disclosure [Line Items] |  |
Commitments to fund investments | $ 150.3 | $ 150.6
Maximum |  |
Commitments And Contingencies Disclosure [Line Items] |  |
Unfunded commitments | $ 0.0 | $ 28.4

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- Details
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