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Common Stock and Equity-Based Compensation - UGI Performance Unit Award Activity (Details) - $ / shares | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
UGI Performance Units and Stock Units |  |  |
UGI Units |  |  |
Number of units - beginning balance (in shares) | 978,834 |  |
Granted (in shares) | 196,114 | 185,379 | 230,653
Number of units - ending balance (in shares) | 959,718 | 978,834 |
Weighted-Average Grant-Date Fair Value (per Unit) |  |  |
Weighted average grant date fair value - beginning balance (in dollars per share) | $ 28.83 |  |
Granted (in dollars per share) | 53.36 | $ 50.08 | $ 33.04
Weighted average grant date fair value - ending balance (in dollars per share) | $ 32.38 | $ 28.83 |
UGI Performance Units |  |  |
UGI Units |  |  |
Granted (in shares) | 143,800 | 42,079,000,000 | 52,493,000,000
Forfeited (in shares) | (38,542) |  |
Performance criteria not met (in shares) | (43,672) |  |
Awards paid (in shares) | (92,950) |  |
Weighted-Average Grant-Date Fair Value (per Unit) |  |  |
Granted (in dollars per share) | $ 55.26 |  |
Forfeited (in dollars per share) | 41.19 |  |
Performance criteria not met (in dollars per share) | 37.57 |  |
Awards paid (in dollars per share) | $ 37.85 |  |
UGI Stock Units |  |  |
UGI Units |  |  |
Granted (in shares) | 52,314 |  |
Awards paid (in shares) | (40,066) |  |
Weighted-Average Grant-Date Fair Value (per Unit) |  |  |
Granted (in dollars per share) | $ 48.11 |  |
Awards paid (in dollars per share) | $ 21.39 |  |
Shares granted under stock awards (percentage) | 70.00% |  |
Vested | UGI Performance Units and Stock Units |  |  |
UGI Units |  |  |
Number of units - beginning balance (in shares) | 660,886 |  |
Number of units - ending balance (in shares) | 660,795 | 660,886 |

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- Definition Share based compensation arrangement by equity instruments other than options forfeited in period weighted average grant date fair value. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award equity instruments other than options unit awards paid. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award equity instruments other than options unit awards paid weighted average grant date fair value. + References No definition available. + Details
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- Definition Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options, Weighted Average Grant Date Fair Value, Performance Criteria Not Met + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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