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Leases - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2024
Lessor, Lease, Description [Line Items]    
Operating and finance leases not yet commenced   $ 0
Renewal term (up to)   9 years
Lease Liability Total | Segment Concentration Risk | AmeriGas Propane    
Lessor, Lease, Description [Line Items]    
Risk percent   80.00%
AmeriGas OLP    
Lessor, Lease, Description [Line Items]    
Sale-leaseback transaction term 6 years  
Cash proceeds $ 32,000,000  
Pre tax gain $ 29,000,000  
Minimum | Vehicles    
Lessor, Lease, Description [Line Items]    
Operating lease remaining lease term   1 year
Maximum | Vehicles    
Lessor, Lease, Description [Line Items]    
Operating lease remaining lease term   10 years