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Equity-Based Compensation (Details) (USD $)
12 Months Ended
Sep. 30, 2013
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 68,633
Number of UGI Units, Granted 20,800
Number of UGI Units, Vested 0
Number of UGI Units, Forfeited (9,069)
Number of UGI Units, performance criteria not met (7,679)
Number of UGI Units, unit awards paid (11,354)
Number of Equity-based Units, ending balance 61,331
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 $ 29.72
Weighted Average Grant Date Fair Value, Granted $ 38.27
Weighted Average Grant Date Fair Value, Vested   
Weighted Average Grant Date Fair Value, Forfeited $ 33.65
Weighted Average Grant Date Fair Value, performance criteria not met $ 22.72
Weighted Average Grant Date Fair Value, unit awards paid $ 22.72
Weighted Average Grant Date Fair Value, end of period $ 34.21
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 24,130
Number of UGI Units, Granted 1,797
Number of UGI Units, Vested (13,768)
Number of UGI Units, Forfeited 0
Number of UGI Units, performance criteria not met (7,679)
Number of UGI Units, unit awards paid (11,354)
Number of Equity-based Units, ending balance 20,662
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 $ 28.78
Weighted Average Grant Date Fair Value, Granted $ 38.27
Weighted Average Grant Date Fair Value, Vested $ 26.24
Weighted Average Grant Date Fair Value, Forfeited $ 0.00
Weighted Average Grant Date Fair Value, performance criteria not met $ 22.72
Weighted Average Grant Date Fair Value, unit awards paid $ 22.72
Weighted Average Grant Date Fair Value, end of period $ 33.49
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 44,503
Number of UGI Units, Granted 19,003
Number of UGI Units, Vested (13,768)
Number of UGI Units, Forfeited (9,069)
Number of UGI Units, performance criteria not met 0
Number of UGI Units, unit awards paid   
Number of Equity-based Units, ending balance 40,669
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 $ 30.23
Weighted Average Grant Date Fair Value, Granted $ 38.27
Weighted Average Grant Date Fair Value, Vested $ 26.24
Weighted Average Grant Date Fair Value, Forfeited $ 33.65
Weighted Average Grant Date Fair Value, performance criteria not met $ 0.00
Weighted Average Grant Date Fair Value, unit awards paid   
Weighted Average Grant Date Fair Value, end of period $ 34.57