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Common Stock and Equity-Based Compensation - Common Stock Share Activity (Details) - UGI Corporation Common Stock - shares
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Common Stock Share Activity      
Beginning balance - shares issued (in shares) 173,806,991 173,770,641 173,675,691
Beginning balance - shares outstanding (in shares) 172,388,503 172,273,781 171,643,287
Employee and director plans - shares issued (in shares) 87,150 36,350 94,950
Employee and director plans - shares outstanding (in shares) 2,442,352 1,191,726 3,023,090
Repurchases of common stock - shares outstanding (in shares) (1,250,000) (1,000,000) (1,227,654)
Reacquired common stock, employee and director plans - shares outstanding (in shares) (620,406) (77,004) (1,164,942)
Ending balance - shares issued (in shares) 173,894,141 173,806,991 173,770,641
Ending balance - shares outstanding (in shares) 172,960,449 172,388,503 172,273,781
Treasury Stock      
Common Stock Share Activity      
Beginning balance - shares issued (in shares) (1,418,488) (1,496,860) (2,032,404)
Employee and director plans - shares issued (in shares) 2,355,202 1,155,376 2,928,140
Repurchases of common stock - held in treasury (in shares) (1,250,000) (1,000,000) (1,227,654)
Reacquired common stock, employee and director plans - held in treasury (in shares) (620,406) (77,004) (1,164,942)
Ending balance - shares issued (in shares) (933,692) (1,418,488) (1,496,860)