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Segment Information - Narrative (Details)
12 Months Ended
Sep. 30, 2018
county
state
segment
Segment Reporting [Abstract]  
Number of reportable segments | segment 4
Number of states to which product sale with propane revenue | state 50
Segment Reporting Information  
Number of counties 1
UGI Utilities  
Segment Reporting Information  
Number of counties 2
France | Geographic Concentration Risk | Revenues  
Segment Reporting Information  
Concentration risk, percentage 20.00%
France | Geographic Concentration Risk | Long-lived Assets  
Segment Reporting Information  
Concentration risk, percentage 15.00%