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Equity-Based Compensation (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award      
Number of equity-based units for unrecognized compensation expense (in units) 57,783 60,583  
Share Based Compensation Types, Excluding Stock Options | UGI Omnibus Equity Compensation Plan      
Share-based Compensation Arrangement by Share-based Payment Award      
Award vesting period (in years) 3 years    
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award      
Exercise period after grant date - no more than (in years) 10 years    
Performance Unit | UGI Units and UGI Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award      
Allocated share-based compensation expense $ 1,924 $ 1,847 $ 1,912
Allocated share-based compensation expense, after-tax $ 1,126 1,081 $ 1,119
Performance Unit | UGI Units and UGI Stock Options | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award      
Percent of target award paid to grantee 0.00%    
Performance Unit | UGI Units and UGI Stock Options | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award      
Percent of target award paid to grantee 200.00%    
Performance Unit | UGI Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award      
Nonvested awards, total compensation cost not yet recognized $ 862    
Nonvested awards, total compensation cost not yet recognized, period for recognition 1 year 11 months    
Performance Unit | UGI Units      
Share-based Compensation Arrangement by Share-based Payment Award      
Nonvested awards, total compensation cost not yet recognized $ 1,104    
Nonvested awards, total compensation cost not yet recognized, period for recognition 1 year 9 months 1 day    
Number of equity-based units for unrecognized compensation expense (in units) 57,783    
Performance Unit | UGI Units | Other Current Liabilities      
Share-based Compensation Arrangement by Share-based Payment Award      
Deferred compensation arrangements, liability, current $ 1,304    
Performance Unit | UGI Units | Other Noncurrent Liabilities      
Share-based Compensation Arrangement by Share-based Payment Award      
Deferred compensation arrangements, liability, noncurrent   $ 1,182