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Common Stock and Equity-Based Compensation - Common Stock Share Activity (Details) - UGI Corporation Common Stock - shares | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Common Stock Share Activity |  |  |
Beginning balance - shares issued (in shares) | 173,894,141 | 173,806,991 | 173,770,641
Beginning balance - shares outstanding (in shares) | 172,960,449 | 172,388,503 | 172,273,781
Employee and director plans - shares issued (in shares) | 93,550 | 87,150 | 36,350
Employee and director plans - shares outstanding (in shares) | 1,145,254 | 2,442,352 | 1,191,726
Sal of reacquired common stock - shares outstanding (in shares) | 50,000 |  |
Repurchases of common stock - shares outstanding (in shares) | (900,000) | (1,250,000) | (1,000,000)
Reacquired common stock, employee and director plans - shares outstanding (in shares) | (111,966) | (620,406) | (77,004)
Ending balance - shares issued (in shares) | 173,987,691 | 173,894,141 | 173,806,991
Ending balance - shares outstanding (in shares) | 173,143,737 | 172,960,449 | 172,388,503
Treasury |  |  |
Common Stock Share Activity |  |  |
Beginning balance - shares issued (in shares) | (933,692) | (1,418,488) | (1,496,860)
Employee and director plans - shares issued (in shares) | 1,051,704 | 2,355,202 | 1,155,376
Sale of reacquired common stock - shares held in treasury (in shares) | 50,000 |  |
Repurchases of common stock - held in treasury (in shares) | (900,000) | (1,250,000) | (1,000,000)
Reacquired common stock, employee and director plans - held in treasury (in shares) | (111,966) | (620,406) | (77,004)
Ending balance - shares issued (in shares) | (843,954) | (933,692) | (1,418,488)

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- Definition Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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- Definition Gross number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References No definition available. + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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