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Inventories (Details) - UGI Utilities
$ in Millions
 9 Months Ended
Jun. 30, 2016
USD ($)
storage_agreement
Bcf
Sep. 30, 2015
USD ($)
Bcf
Jun. 30, 2015
USD ($)
Bcf
Inventory      
SCAA contract term (in years) 3 years    
Storage Contract Administrative Agreements      
Inventory      
Number of storage agreements | storage_agreement 2    
Volume of gas storage inventories released under SCAAs with non-affiliates (in cubic feet) | Bcf 1.8 4.0 1.9
Carrying value of gas storage inventories released under SCAAs with non-affiliates | $ $ 3.3 $ 9.8 $ 4.5