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Debt - Schedule of Short-term Debt (Footnotes) (Details)
12 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2019
EUR (€)
Aug. 13, 2019
USD ($)
Aug. 12, 2019
USD ($)
Jun. 27, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2018
EUR (€)
Energy Services Credit Agreement | Minimum              
Short-term Debt              
Basis spread on variable rate (percentage) 0.75%            
Energy Services Credit Agreement | Maximum              
Short-term Debt              
Basis spread on variable rate (percentage) 2.25%            
Energy Services Credit Agreement | Federal Funds Effective Swap Rate              
Short-term Debt              
Basis spread on variable rate (percentage) 0.50%            
Energy Services Credit Agreement | LIBOR              
Short-term Debt              
Basis spread on variable rate (percentage) 1.00%            
UGI International LLC              
Short-term Debt              
Borrowing $ 210,000,000.0 € 192,700,000         € 0
Total capacity | €   € 300,000,000.0         € 300,000,000.0
UGI Utilities              
Short-term Debt              
Borrowing 166,000,000.0         $ 189,500,000  
Total capacity $ 350,000,000.0         450,000,000.0  
UGI Utilities | 2019 Credit Agreement | Line of Credit              
Short-term Debt              
Total capacity         $ 350,000,000    
UGI Utilities | 2019 Credit Agreement | Minimum | Line of Credit              
Short-term Debt              
Basis spread on variable rate (percentage) 0.00%            
UGI Utilities | 2019 Credit Agreement | Maximum | Line of Credit              
Short-term Debt              
Basis spread on variable rate (percentage) 1.75%            
UGI Utilities | Letter of Credit | 2019 Credit Agreement | Line of Credit              
Short-term Debt              
Total capacity $ 50,000,000       $ 100,000,000    
Energy Services              
Short-term Debt              
Borrowing 45,000,000.0         0  
Total capacity $ 200,000,000.0   $ 200,000,000 $ 240,000,000   $ 240,000,000.0