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Common Stock and Equity-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jan. 30, 2014
Jan. 24, 2013
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award          
Treasury stock acquired     $ 38.6 $ 36.9  
Pre-tax equity-based compensation expense     19.3 23.8 $ 29.2
After tax equity-based compensation expense     11.8 15.4 18.9
Cash received from stock option exercises     17.7 27.3 16.2
Associated tax benefits     9.6 $ 14.9 $ 5.8
Unrecognized compensation cost associated with unvested unit awards     $ 7.0    
Weighted-average period of recognition for unvested unit awards     1 year 11 months    
UGI Stock Option Awards          
Share-based Compensation Arrangement by Share-based Payment Award          
Weighted-average fair value of stock option granted under stock plans (in dollars per share)     $ 7.62 $ 4.87 $ 5.47
Amerigas Performance Units and Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award          
Unrecognized compensation cost associated with unvested unit awards     $ 1.7    
Weighted-average period of recognition for unvested unit awards     1 year 8 months 24 days    
UGI Unit awards outstanding (in shares)     218,224 210,549  
Fair value of unit awards vested     $ 2.1 $ 2.0 $ 2.6
Liabilities associated with share based compensation     $ 2.5 $ 3.5  
AmeriGas Performance Units          
Share-based Compensation Arrangement by Share-based Payment Award          
Expected term of Performance Unit awards     3 years    
Expected volatility measurement period (in years)     3 years    
UGI Units awarded (in shares)     49,225    
Weighted average grant date fair value unit awards (in dollars per share)     $ 54.24    
AmeriGas Performance Units | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award          
Percentage of target award to be granted     0.00%    
AmeriGas Performance Units | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award          
Percentage of target award to be granted     200.00%    
AmeriGas Partners Common Units          
Share-based Compensation Arrangement by Share-based Payment Award          
UGI Units awarded (in shares)     18,338    
Weighted average grant date fair value unit awards (in dollars per share)     $ 47.33    
UGI Performance Units and Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award          
Unrecognized compensation cost associated with unvested unit awards     $ 8.4    
Weighted-average period of recognition for unvested unit awards     1 year 10 months 24 days    
Award performance period     3 years    
UGI Units awarded (in shares)     185,379 230,653 180,724
Weighted average grant date fair value unit awards (in dollars per share)     $ 50.08 $ 33.04 $ 38.20
UGI Unit awards outstanding (in shares)     978,834 999,083  
Fair value of unit awards vested     $ 7.1 $ 9.7 $ 15.3
Liabilities associated with share based compensation     $ 13.1 $ 18.5  
UGI Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award          
UGI Units awarded (in shares)     42,079 52,493 39,801
Weighted average grant date fair value unit awards (in dollars per share)     $ 47.25    
UGI Performance Units          
Share-based Compensation Arrangement by Share-based Payment Award          
Weighted-average fair value of stock option granted under stock plans (in dollars per share)     $ 50.91 $ 32.64 $ 38.43
Expected term of Performance Unit awards     3 years    
Expected volatility measurement period (in years)     3 years    
UGI Units awarded (in shares)     143,300    
Weighted average grant date fair value unit awards (in dollars per share)     $ 50.91    
Issued on or after January 1, 2013 | UGI Performance Units and Stock Units | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award          
Percentage of target award to be granted     0.00%    
Issued on or after January 1, 2013 | UGI Performance Units and Stock Units | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award          
Percentage of target award to be granted     200.00%    
Issued prior to January 1, 2013 | UGI Performance Units and Stock Units | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award          
Percentage of target award to be granted     0.00%    
Issued prior to January 1, 2013 | UGI Performance Units and Stock Units | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award          
Percentage of target award to be granted     200.00%    
Issued on or after January 1, 2015 | AmeriGas Performance Units | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award          
Modification range for grants issued in January 2015     70.00%    
Issued on or after January 1, 2015 | AmeriGas Performance Units | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award          
Percentage of target award to be granted     200.00%    
Modification range for grants issued in January 2015     130.00%    
Grants Issued in January 2015 | AmeriGas Performance Units | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award          
Percentage of target award to be granted     0.00%    
Grants Issued in January 2015 | AmeriGas Performance Units | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award          
Percentage of target award to be granted     200.00%    
Grants Issued in January 2016 | AmeriGas Performance Units | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award          
Percentage of target award to be granted     0.00%    
Grants Issued in January 2016 | AmeriGas Performance Units | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award          
Percentage of target award to be granted     200.00%    
Total Unitholder Return at 25th Percentile | Issued on or after January 1, 2013 | AmeriGas Performance Units          
Share-based Compensation Arrangement by Share-based Payment Award          
Percentage of target award to be granted     25.00%    
Total Unitholder Return at 25th Percentile | Issued on or after January 1, 2013 | UGI Performance Units and Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award          
Percentage of target award to be granted     25.00%    
Total Unitholder Return at 40th Percentile | Issued on or after January 1, 2013 | AmeriGas Performance Units          
Share-based Compensation Arrangement by Share-based Payment Award          
Percentage of target award to be granted     70.00%    
Total Unitholder Return at 40th Percentile | Issued on or after January 1, 2013 | UGI Performance Units and Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award          
Percentage of target award to be granted     70.00%    
Total Unitholder Return at 40th Percentile | Issued prior to January 1, 2013 | UGI Performance Units and Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award          
Percentage of target award to be granted     50.00%    
Total Unitholder Return at 50th Percentile | Issued on or after January 1, 2013 | AmeriGas Performance Units          
Share-based Compensation Arrangement by Share-based Payment Award          
Percentage of target award to be granted     100.00%    
Total Unitholder Return at 50th Percentile | Issued on or after January 1, 2013 | UGI Performance Units and Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award          
Percentage of target award to be granted     100.00%    
Total Unitholder Return at 50th Percentile | Issued prior to January 1, 2013 | UGI Performance Units and Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award          
Percentage of target award to be granted     100.00%    
Total Unitholder Return at 100th Percentile | Issued prior to January 1, 2013 | UGI Performance Units and Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award          
Percentage of target award to be granted     200.00%    
Total Unitholder Return at 60th Percentile | Issued on or after January 1, 2013 | AmeriGas Performance Units          
Share-based Compensation Arrangement by Share-based Payment Award          
Percentage of target award to be granted     125.00%    
Total Unitholder Return at 75th Percentile | Issued on or after January 1, 2013 | AmeriGas Performance Units          
Share-based Compensation Arrangement by Share-based Payment Award          
Percentage of target award to be granted     162.50%    
Total Unitholder Return at 90th Percentile | Issued on or after January 1, 2013 | AmeriGas Performance Units          
Share-based Compensation Arrangement by Share-based Payment Award          
Percentage of target award to be granted     200.00%    
Total Unitholder Return at 90th Percentile | Issued on or after January 1, 2013 | UGI Performance Units and Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award          
Percentage of target award to be granted     200.00%    
Total Unitholder Return Highest of Propane MLP Group | Certain Grants Issued on or After January 1, 2014 | AmeriGas Performance Units          
Share-based Compensation Arrangement by Share-based Payment Award          
Percentage of target award to be granted     150.00%    
2010 Propane Plan | Amerigas Performance Units and Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award          
Expiration period     10 years    
Common Stock awards granted (in shares)     2,800,000    
Award performance period     3 years    
2010 Propane Plan | AmeriGas Partners Common Units          
Share-based Compensation Arrangement by Share-based Payment Award          
Weighted-average fair value of stock option granted under stock plans (in dollars per share)     $ 52.37 $ 37.93 $ 61.00
UGI Units awarded (in shares)     67,563 73,080 80,336
Number of common unit awards available for future grant (in shares)     2,287,879    
UGI Corporation Common Stock          
Share-based Compensation Arrangement by Share-based Payment Award          
Maximum number of shares authorized for repurchase (in shares) 15,000,000        
Duration of stock repurchase program 4 years        
Treasury stock acquired     $ 43.3 $ 47.6 $ 34.1
UGI Corporation Common Stock | 2013 Omnibus Incentive Compensation Plan (OICP)          
Share-based Compensation Arrangement by Share-based Payment Award          
Expiration period   10 years      
Common Stock awards granted (in shares)   21,750,000      
Number of common unit awards available for future grant (in shares)     10,851,819    
UGI Corporation Common Stock | 2004 Omnibus Equity Compensation Plan (OECP)          
Share-based Compensation Arrangement by Share-based Payment Award          
Expiration period     10 years    
Number of common unit awards available for future grant (in shares)     4,116    
UGI Corporation Common Stock | Treasury Stock          
Share-based Compensation Arrangement by Share-based Payment Award          
Treasury stock acquired (in shares)     900,000 1,250,000 1,000,000