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Common Stock and Equity-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 30, 2014 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Jan. 25, 2018
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Treasury stock acquired |  | $ 19.7 | $ 38.6 |  |
Pre-tax equity-based compensation expense |  | 22.5 | 19.3 | $ 23.8 |
After tax equity-based compensation expense |  | 15.7 | 11.8 | 15.4 |
Cash received from stock option exercises |  | 43.4 | 17.7 | 27.3 |
Associated tax benefits |  | 12.6 | $ 9.6 | $ 14.9 |
Unrecognized compensation cost associated with unvested unit awards |  | $ 7.9 |  |  |
Weighted-average period of recognition for unvested unit awards |  | 2 years 1 month |  |  |
UGI Stock Option Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Weighted-average fair value of stock option granted under stock plans (in dollars per share) |  | $ 7.51 | $ 7.62 | $ 4.87 |
Amerigas Performance Units and Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Unrecognized compensation cost associated with unvested unit awards |  | $ 1.9 |  |  |
Weighted-average period of recognition for unvested unit awards |  | 1 year 8 months |  |  |
UGI Unit awards outstanding (in shares) |  | 236,762 | 218,224 |  |
Fair value of unit awards vested |  | $ 2.2 | $ 2.1 | $ 2.0 |
Liabilities associated with share based compensation |  | $ 2.3 | $ 2.5 |  |
AmeriGas Performance Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Expected term of Performance Unit awards |  | 3 years |  |  |
Expected volatility measurement period (in years) |  | 3 years |  |  |
UGI Units awarded (in shares) |  | 55,550 |  |  |
Weighted average grant date fair value unit awards (in dollars per share) |  | $ 52.14 |  |  |
AmeriGas Performance Units | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Percentage of target award to be granted |  | 0.00% |  |  |
AmeriGas Performance Units | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Percentage of target award to be granted |  | 200.00% |  |  |
AmeriGas Partners Common Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
UGI Units awarded (in shares) |  | 29,261 |  |  |
Weighted average grant date fair value unit awards (in dollars per share) |  | $ 46.09 |  |  |
UGI Performance Units and Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Unrecognized compensation cost associated with unvested unit awards |  | $ 9.4 |  |  |
Weighted-average period of recognition for unvested unit awards |  | 1 year 9 months 24 days |  |  |
Award performance period |  | 3 years |  |  |
UGI Units awarded (in shares) |  | 196,114 | 185,379 | 230,653 |
Weighted average grant date fair value unit awards (in dollars per share) |  | $ 53.36 | $ 50.08 | $ 33.04 |
UGI Unit awards outstanding (in shares) |  | 959,718 | 978,834 |  |
Fair value of unit awards vested |  | $ 7.3 | $ 7.1 | $ 9.7 |
Liabilities associated with share based compensation |  | $ 18.8 | $ 13.1 |  |
UGI Performance Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Weighted-average fair value of stock option granted under stock plans (in dollars per share) |  | $ 55.26 | $ 50.91 | $ 32.64 |
Expected term of Performance Unit awards |  | 3 years |  |  |
Expected volatility measurement period (in years) |  | 3 years |  |  |
UGI Units awarded (in shares) |  | 143,800 | 42,079,000,000 | 52,493,000,000 |
Weighted average grant date fair value unit awards (in dollars per share) |  | $ 55.26 |  |  |
Issued on or after January 1, 2013 | UGI Performance Units and Stock Units | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Percentage of target award to be granted |  | 0.00% |  |  |
Issued on or after January 1, 2013 | UGI Performance Units and Stock Units | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Percentage of target award to be granted |  | 200.00% |  |  |
Issued on or after January 1, 2015 | AmeriGas Performance Units | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Modification range for grants issued in January 2015 |  | 70.00% |  |  |
Issued on or after January 1, 2015 | AmeriGas Performance Units | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Percentage of target award to be granted |  | 200.00% |  |  |
Modification range for grants issued in January 2015 |  | 130.00% |  |  |
Grants Issued in January 2015 | AmeriGas Performance Units | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Percentage of target award to be granted |  | 0.00% |  |  |
Grants Issued in January 2015 | AmeriGas Performance Units | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Percentage of target award to be granted |  | 200.00% |  |  |
Grants Issued in January 2016 | AmeriGas Performance Units | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Percentage of target award to be granted |  | 0.00% |  |  |
Grants Issued in January 2016 | AmeriGas Performance Units | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Percentage of target award to be granted |  | 200.00% |  |  |
Total Unitholder Return at 25th Percentile | Issued on or after January 1, 2013 | AmeriGas Performance Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Percentage of target award to be granted |  | 25.00% |  |  |
Total Unitholder Return at 25th Percentile | Issued on or after January 1, 2013 | UGI Performance Units and Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Percentage of target award to be granted |  | 25.00% |  |  |
Total Unitholder Return at 40th Percentile | Issued on or after January 1, 2013 | AmeriGas Performance Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Percentage of target award to be granted |  | 70.00% |  |  |
Total Unitholder Return at 40th Percentile | Issued on or after January 1, 2013 | UGI Performance Units and Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Percentage of target award to be granted |  | 70.00% |  |  |
Total Unitholder Return at 50th Percentile | Issued on or after January 1, 2013 | AmeriGas Performance Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Percentage of target award to be granted |  | 100.00% |  |  |
Total Unitholder Return at 50th Percentile | Issued on or after January 1, 2013 | UGI Performance Units and Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Percentage of target award to be granted |  | 100.00% |  |  |
Total Unitholder Return at 60th Percentile | Issued on or after January 1, 2013 | AmeriGas Performance Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Percentage of target award to be granted |  | 125.00% |  |  |
Total Unitholder Return at 75th Percentile | Issued on or after January 1, 2013 | AmeriGas Performance Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Percentage of target award to be granted |  | 162.50% |  |  |
Total Unitholder Return at 90th Percentile | Issued on or after January 1, 2013 | AmeriGas Performance Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Percentage of target award to be granted |  | 200.00% |  |  |
Total Unitholder Return at 90th Percentile | Issued on or after January 1, 2013 | UGI Performance Units and Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Percentage of target award to be granted |  | 200.00% |  |  |
Total Unitholder Return Highest of Propane MLP Group | Certain Grants Issued on or After January 1, 2014 | AmeriGas Performance Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Percentage of target award to be granted |  | 150.00% |  |  |
2010 Propane Plan | Amerigas Performance Units and Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Expiration period |  | 10 years |  |  |
Common Stock awards granted (in shares) |  | 2,800,000 |  |  |
Award performance period |  | 3 years |  |  |
2010 Propane Plan | AmeriGas Partners Common Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Weighted-average fair value of stock option granted under stock plans (in dollars per share) |  | $ 50.05 | $ 52.37 | $ 37.93 |
UGI Units awarded (in shares) |  | 84,811 | 67,563 | 73,080 |
Number of common unit awards available for future grant (in shares) |  | 2,242,468 |  |  |
UGI Corporation Common Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Maximum number of shares authorized for repurchase (in shares) | 15,000,000 |  |  |  | 8,000,000,000,000
Duration of stock repurchase program | 4 years |  |  |  |
Treasury stock acquired |  | $ 59.8 | $ 43.3 | $ 47.6 |
UGI Corporation Common Stock | 2013 Omnibus Incentive Compensation Plan (OICP) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Expiration period |  | 10 years |  |  |
Common Stock awards granted (in shares) |  | 21,750,000 |  |  |
Number of common unit awards available for future grant (in shares) |  | 9,043,267,000,000 |  |  |
UGI Corporation Common Stock | Treasury Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Treasury stock acquired (in shares) |  | 1,200,000 | 900,000 | 1,250,000 |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -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 Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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