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Commitment and Contingencies - Additional Information (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Sep. 30, 2023
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Commitments And Contingencies [Line Items] |  |
Reserve for unpaid and incurred but not reported claims, amount | $ 165.3 | $ 159.9
Reserve for unpaid and incurred but not reported claims, classified in current liabilities | 54.2 | 54.8
Reserve for unpaid and incurred but not reported claims, classified in non-current liabilities | 111.1 | 105.1
Claims recoverable from third party insurance carriers | 16.1 | 18.1
Other Current Assets |  |
Commitments And Contingencies [Line Items] |  |
Claims recoverable from third party insurance carriers | 4.8 | 5.3
Other Assets |  |
Commitments And Contingencies [Line Items] |  |
Claims recoverable from third party insurance carriers | $ 11.3 | $ 12.8

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