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Inventories (Details) - UGI Utilities
$ in Millions, ft³ in Billions
 12 Months Ended
Sep. 30, 2016
USD ($)
storage_agreement
ft³
Sep. 30, 2015
USD ($)
ft³
Public Utilities, Inventory    
Storage agreement term (in years) 3 years  
Storage Contract Administrative Agreements    
Public Utilities, Inventory    
Number of storage agreements | storage_agreement 3  
Volume of gas storage inventories released under SCAAs with non-affiliates (in cubic feet) | ft³ 3.5 4.0
Carrying value of gas storage inventories released under SCAAs with non-affiliates | $ $ 7.6 $ 9.8