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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