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Inventories - Narrative (Details) - UGI Utilities
$ in Millions
6 Months Ended
Mar. 31, 2017
storage_agreement
Bcf
Sep. 30, 2016
USD ($)
Bcf
Mar. 31, 2016
USD ($)
Bcf
Inventory      
Number of storage agreements | storage_agreement 5    
Volume of gas storage inventories released under SCAAs with non-affiliates (in bcf) | Bcf 0 3.5 0.2
Carrying value of gas storage inventories released under SCAAs with non-affiliates | $   $ 7.6 $ 0.5
Minimum      
Inventory      
SCAA contract term (in years) 1 year    
Maximum      
Inventory      
SCAA contract term (in years) 3 years