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Common Stock and Equity Based Compensation (Details)
12 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2013
Common Stock [Member]
Sep. 30, 2012
Common Stock [Member]
Sep. 30, 2011
Common Stock [Member]
Sep. 30, 2013
Treasury Stock [Member]
Sep. 30, 2012
Treasury Stock [Member]
Sep. 30, 2011
Treasury Stock [Member]
Sep. 30, 2013
Common Stock Outstanding [Member]
Sep. 30, 2012
Common Stock Outstanding [Member]
Sep. 30, 2011
Common Stock Outstanding [Member]
Sep. 30, 2013
2004 OECP [Member]
UGI Performance Unit [Member]
Sep. 30, 2013
2013 OICP [Member]
UGI Performance Unit [Member]
Class of Stock [Line Items]                              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights                           grantees may receive 0% to 200% of the target award granted. For such grants, if UGI’s TSR ranks below the 40th percentile compared to the UGI comparator group, the employee will not be paid. At the 40th percentile, the employee will be paid an award equal to 50% of the target award; at the 50th percentile, 100%; and at the 100th percentile, 200% grantees may receive 0% to 200% of the target award granted. For such grants, if UGI’s TSR ranks below the 25th percentile compared to the UGI comparator group, the employee will not be paid. At the 40th percentile, the employee will be paid an award equal to 70% of the target award; at the 50th percentile, 100%; and at the 90th percentile, 200%
Minimum Percentage Amount of Guarantee on Target Award Granted                           0.00% 0.00%
Common stock share activity                              
Common Stock, Shares, Issued, Beginning Balance 115,624,594 115,783,794 115,507,094 115,400,294                      
Treasury Stock, Shares, Beginning Balance (3,671,072) (1,354,936)   (5,026,707)                      
Common Stock, Shares, Outstanding, Beginning Balance 111,836,022 114,428,858   110,373,587                      
Issued                              
Employee and director plans               2,622,338 824,925 1,263,065 2,781,538 942,425 1,369,865    
Employee and director plans, Issued         159,200 117,500 106,800                
Dividend reinvestment plan               62,169 104,994 92,570 62,169 104,994 92,570    
Shares reacquired - employee and director plans (263,020)                            
Common Stock, Shares, Issued, Ending Balance 115,624,594 115,783,794 115,507,094 115,400,294                      
Treasury Stock, Shares, Ending Balance (3,004,173) (1,354,936)   (5,026,707)                      
Common Stock, Shares, Outstanding, Ending Balance 112,620,421 114,428,858   110,373,587                      
Shares reacquired - employee and director plans               (1,035,270)     (1,035,270)        
Maximum Percentage Amount of Guarantee on Target Award Granted                           200.00% 200.00%
Percentage of Target Award Paid at Fortieth Percentile                           50.00% 70.00%
Percentage of Target Award Paid at Fiftieth Percentile                           100.00% 100.00%
Percentage of Target Award Paid at Hundredth Percentile                           200.00% 200.00%