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Equity-Based Compensation (Details) (USD $)
12 Months Ended
Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Number of Equity-based Units, beginning balance 59,799
Number of UGI Units, Granted 27,100
Number of UGI Units, Vested 0
Number of UGI Units, performance criteria not met (18,266)
Number of Equity-based Units, ending balance 68,633
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]  
Weighted Average Grant Date Fair Value, beginning of period $ 29.10
Weighted Average Grant Date Fair Value, Granted $ 29.89
Weighted Average Grant Date Fair Value, Vested   
Weighted Average Grant Date Fair Value, performance criteria not met $ 27.96
Weighted Average Grant Date Fair Value, end of period $ 29.72
Vested [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Number of Equity-based Units, beginning balance 18,155
Number of UGI Units, Granted 7,764
Number of UGI Units, Vested 16,477
Number of UGI Units, performance criteria not met (18,266)
Number of Equity-based Units, ending balance 24,130
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]  
Weighted Average Grant Date Fair Value, beginning of period $ 27.33
Weighted Average Grant Date Fair Value, Granted $ 31.50
Weighted Average Grant Date Fair Value, Vested $ 28.18
Weighted Average Grant Date Fair Value, performance criteria not met $ 27.96
Weighted Average Grant Date Fair Value, end of period $ 28.78
Non-Vested [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Number of Equity-based Units, beginning balance 41,644
Number of UGI Units, Granted 19,336
Number of UGI Units, Vested (16,477)
Number of UGI Units, performance criteria not met 0
Number of Equity-based Units, ending balance 44,503
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]  
Weighted Average Grant Date Fair Value, beginning of period $ 29.87
Weighted Average Grant Date Fair Value, Granted $ 29.25
Weighted Average Grant Date Fair Value, Vested $ 28.18
Weighted Average Grant Date Fair Value, performance criteria not met $ 0.00
Weighted Average Grant Date Fair Value, end of period $ 30.23