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Common Stock And Equity Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended
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Jan. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2012 UGI Corporation | Sep. 30, 2014 UGI Corporation Common Stock | Sep. 30, 2013 UGI Corporation Common Stock | Sep. 30, 2012 UGI Corporation Common Stock | Jan. 30, 2014 UGI Corporation Common Stock | Mar. 31, 2012 AmeriGas Partners Common Units | Sep. 30, 2014 UGI Stock Option Awards | Sep. 30, 2013 UGI Stock Option Awards | Sep. 30, 2012 UGI Stock Option Awards | Sep. 30, 2014 Amerigas Performance Units and Stock Units | Sep. 30, 2013 Amerigas Performance Units and Stock Units | Sep. 30, 2012 Amerigas Performance Units and Stock Units | Sep. 30, 2014 AmeriGas Performance Unit | Sep. 30, 2014 AmeriGas Partners Common Units | Sep. 30, 2014 UGI Performance Units and Stock Units | Sep. 30, 2013 UGI Performance Units and Stock Units | Sep. 30, 2012 UGI Performance Units and Stock Units | Sep. 30, 2014 UGI Stock Units | Sep. 30, 2013 UGI Stock Units | Sep. 30, 2012 UGI Stock Units | Sep. 30, 2014 UGI Performance Units | Sep. 30, 2013 UGI Performance Units | Sep. 30, 2012 UGI Performance Units | Jan. 12, 2012 Heritage Propane | Jan. 12, 2012 Heritage Propane | Sep. 30, 2014 Noncontrolling Interests | Sep. 30, 2013 Noncontrolling Interests | Sep. 30, 2012 Noncontrolling Interests | Sep. 30, 2012 Noncontrolling Interests UGI Corporation | Sep. 30, 2014 2004 Omnibus Equity Compensation Plan (OECP) UGI Corporation Common Stock | Sep. 30, 2014 2004 Omnibus Equity Compensation Plan (OECP) UGI Performance Units and Stock Units | Sep. 30, 2014 2004 Omnibus Equity Compensation Plan (OECP) UGI Performance Units | Sep. 30, 2014 2013 Omnibus Incentive Compensation Plan (OICP) UGI Corporation Common Stock | Jan. 24, 2013 2013 Omnibus Incentive Compensation Plan (OICP) UGI Corporation Common Stock | Sep. 30, 2014 2013 Omnibus Incentive Compensation Plan (OICP) UGI Performance Units and Stock Units | Sep. 30, 2014 2013 Omnibus Incentive Compensation Plan (OICP) UGI Performance Units | Sep. 30, 2014 2010 Propane Plan Amerigas Performance Units and Stock Units | Jun. 30, 2010 2010 Propane Plan Amerigas Performance Units and Stock Units | Sep. 30, 2013 2010 Propane Plan AmeriGas Performance Unit | Sep. 30, 2014 2010 Propane Plan AmeriGas Partners Common Units | Sep. 30, 2013 2010 Propane Plan AmeriGas Partners Common Units | Sep. 30, 2012 2010 Propane Plan AmeriGas Partners Common Units
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of shares authorized for repurchase |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Share-based Compensation, Gross |  |  |  |  |  | 94,950 | 238,800 | 176,250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock acquired (in usd) |  | $ 44.7 | $ 32.3 |  |  |  |  |  | $ 39.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Units issued by AmeriGas Partners (in units) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 29,567,362 | 29,567,362 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Units sold in public offering |  |  |  |  |  |  |  |  |  | 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in stockholders' equity, net |  |  |  |  | 196.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to reflect change in ownership of AmeriGas Partners, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (321.4) | (321.4) |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax equity-based compensation expense |  | 25.8 | 17.6 | 14.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
After tax equity-based compensation expense |  | 16.6 | 11.4 | 8.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of UGI Common Stock granted as awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,750,000 |  |  |  | 2,800,000 |  |  |  |
Cash received from stock option exercises |  | 22.2 | 30.8 | 9.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Associated tax benefits |  | 13.0 | 12.1 | 2.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost associated with unvested Amerigas unit awards |  | 6.5 |  |  |  |  |  |  |  |  |  |  |  | 2.9 |  |  |  |  | 8.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average period for unvested Amerigas unit awards |  | 1 year 8 months 12 days |  |  |  |  |  |  |  |  |  |  |  | 1 year 8 months 12 days |  |  |  |  | 1 year 8 months 12 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average fair value of stock option granted under stock plans |  |  |  |  |  |  |  |  |  |  | $ 4.97 | $ 3.29 | $ 2.87 |  |  |  |  |  |  |  |  |  |  |  |  | $ 32.32 | $ 25.31 | $ 18.17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 43.34 | $ 42.58 | $ 43.22
Award performance period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Target award paid to employee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 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 25th percentile, the employee will be paid an award equal to 25% of the target award; at the 40th percentile, 70%; at the 50th percentile, 100%; and at the 90th percentile and above, 200% |  |  |  |  |  |  |
Minimum percentage amount of guarantee on target award granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  | 0.00% |  |  |  |  |  |
Maximum percentage amount of guarantee on target award granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200.00% |  |  |  | 200.00% |  |  |  |  |  |
Percentage of target award paid at 40th percentile |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  | 70.00% |  |  |  |  |  |
Percentage of target award paid at 50th percentile |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  | 100.00% |  |  |  |  |  |
Percentage of target award paid at 100th percentile |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200.00% |  |  |  | 200.00% |  |  |  |  |  |
Expected term of Performance Unit awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |
Granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 53,800 | 32,658 | 234,264 | 381,900 | 359,768 | 44,814 | [1] | 51,038 | 63,668 | 189,450 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 86,458 | 65,136 | 248,818
Weighted average grant date fair value unit awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 41.50 | $ 46.37 | $ 31.38 | $ 24.87 | $ 18.45 | $ 27.41 | [1] |  |  | $ 32.32 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost associated with common unit |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,235 | 224,167 |  |  |  | 1,306,181 | 1,380,902 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of AmeriGas units vested |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.1 | 2.8 | 5.1 |  |  | 8.7 | 6.0 | 3.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities associated with share based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.5 | $ 1.1 |  |  |  | $ 18.5 | $ 8.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common units subject to original awards granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 172,646 |  |  | 17,499,524 |  |  |  |  |  |  | 2,443,808 |  |
Performance units ultimately paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Granted Under Plan Term (in years) |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Period in Force | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Generally, shares granted under UGI Stock Unit awards are paid approximately 70% in shares. UGI Stock Unit awards granted in Fiscal 2013 and Fiscal 2012 were 51,038 and 63,668, respectively.

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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=6415400&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=6415400&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=6415400&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=6415400&loc=d3e5070-113901 + 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=6415400&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=6415400&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=6415400&loc=d3e5070-113901 + 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 The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 + Details
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