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Commitments and Contingencies (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024
Commitments and Contingencies Disclosure [Abstract] |  |
Loss contingency, range of possible loss, portion not accrued | $ 9.2 |
Loss contingency accrual | 3.3 |
Purchase obligation, due in next twelve months | 150,309.5 |
Purchase obligation, due in second and third year | 651.0 |
Purchase obligation, due in fourth and fifth year | 102.3 |
Purchase obligation, due after fifth year | 1,280.9 |
Purchase obligation, due in next twelve months | $ 147,941.2 |
Percentage of stop loss actual estimated claims (as a percent) | 120.00% |
Self insurance reserve and dental claims | $ 2.0 | $ 2.2

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