Amount of net assets restricted from transfer to parent company under different agreements.

Name:	ugi_AmountOfNetAssetsRestrictedFromTransferToParentCompanyUnderDifferentAgreements
Namespace Prefix:	ugi
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Base rate for revolving credit agreement.

+ Details

Name:	ugi_BaseRateForRevolvingCreditAgreement
Namespace Prefix:	ugi
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Borrowing capacity of credit agreement terminated.

+ Details

Name:	ugi_BorrowingCapacityOfCreditAgreementTerminated
Namespace Prefix:	ugi
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Credit agreement facility fee rate.

+ Details

Name:	ugi_CreditAgreementFacilityFeeRate
Namespace Prefix:	ugi
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument additional.

+ Details

Name:	ugi_DebtInstrumentAdditionalTextualAbstract
Namespace Prefix:	ugi
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument.

+ Details

Name:	ugi_DebtInstrumentTextualAbstract
Namespace Prefix:	ugi
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Effective EURIBOR rate of interest on term loan.

+ Details

Name:	ugi_EffectiveEuriborRateOfInterestOnTermLoan
Namespace Prefix:	ugi
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Effective EURIBOR rate of interest on term loan thereafter.

+ Details

Name:	ugi_EffectiveEuriborRateOfInterestOnTermLoanThereafter
Namespace Prefix:	ugi
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Eurodollar rate on credit agreement borrowings.

+ Details

Name:	ugi_EurodollarRateOnCreditAgreementBorrowings
Namespace Prefix:	ugi
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Existing revolving credit arrangement termination amount.

+ Details

Name:	ugi_ExistingRevolvingCreditArrangementTerminationAmount
Namespace Prefix:	ugi
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Margin on credit agreement base rate borrowings.

+ Details

Name:	ugi_MarginOnCreditAgreementBaseRateBorrowings
Namespace Prefix:	ugi
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Minimum consolidated indebtedness.

+ Details

Name:	ugi_MinimumConsolidatedIndebtedness
Namespace Prefix:	ugi
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

- Definition

Minimum Consolidated Net worth for maximum ratio of consolidated totals indebtedness to consolidated total capitalization.

+ Details

Name:	ugi_MinimumConsolidatedNetWorth
Namespace Prefix:	ugi
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage of redemption at option.

+ Details

Name:	ugi_PercentageOfRedemptionAtOption
Namespace Prefix:	ugi
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Rate of interest above alternate base rate.

+ Details

Name:	ugi_RateOfInterestAboveAlternateBaseRate
Namespace Prefix:	ugi
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Rate of interest above federal fund rate.

+ Details

Name:	ugi_RateOfInterestAboveFederalFundRate
Namespace Prefix:	ugi
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Rate of interest above LIBOR Rate

+ Details

Name:	ugi_RateOfInterestAboveLiborRate
Namespace Prefix:	ugi
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Rate of interest above one month LIBOR rate.

+ Details

Name:	ugi_RateOfInterestAboveOneMonthLiborRate
Namespace Prefix:	ugi
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Ratio of consolidated debt to consolidated capital.

+ Details

Name:	ugi_RatioOfConsolidatedDebtToConsolidatedCapital
Namespace Prefix:	ugi
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

Ratio of consolidated total indebtedness to EBITDA.

+ Details

Name:	ugi_RatioOfConsolidatedIndebtednessToEbitda
Namespace Prefix:	ugi
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

Ratio of net debt to EBITDA.

+ Details

Name:	ugi_RatioOfNetDebtToEbitda
Namespace Prefix:	ugi
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

Receivables securitization facility under energy services.

+ Details

Name:	ugi_ReceivablesSecuritizationFacilityUnderEnergyServices
Namespace Prefix:	ugi
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Expected reduction in net income.

+ Details

Name:	ugi_ReductionInNetIncomeAttributableToCompany
Namespace Prefix:	ugi
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Revolving credit agreement sublimit for letters of credit.

+ Details

Name:	ugi_RevolvingCreditAgreementSublimitForLettersOfCredit
Namespace Prefix:	ugi
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Semi annual principal payments due.

+ Details

Name:	ugi_SemiAnnualPrincipalPaymentsDue
Namespace Prefix:	ugi
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Term period of senior facilities agreement.

+ Details

Name:	ugi_TermPeriodOfSeniorFacilitiesAgreement
Namespace Prefix:	ugi
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

+ 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 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number APB14-1

-Paragraph 31

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount represents the difference between the fair value of the payments made and the carrying amount of the debt at the time of its extinguishment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 50

-Section 40

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 26

-Paragraph 20, 21

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 50

-Section 40

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629

+ Details

Name:	us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 45

-Paragraph 13

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (b)(1)

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

+ Details

Name:	us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityAmountOutstanding
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Reflects when the credit facility terminates, which may be presented in a variety of ways (year, month and year, day, month and year, quarter).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate
Namespace Prefix:	us-gaap
Data Type:	us-types:dateStringItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateDescription
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The effective interest rate during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
Namespace Prefix:	us-gaap
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

+ 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 210.5-02.22)

-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 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 7

-Section 03

-Paragraph 16

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20, 22

-Article 5

+ Details

Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt maturing in year five following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 47

-Paragraph 10

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt maturing in year four following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.

+ References

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt maturing in year three following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.

+ References

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 18

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 19

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 18

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 20

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

Name:	us-gaap_RepaymentsOfSeniorDebt
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Debt (Details Textual) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended						12 Months Ended												3 Months Ended	12 Months Ended			3 Months Ended			1 Months Ended		12 Months Ended		12 Months Ended					1 Months Ended		3 Months Ended			12 Months Ended										12 Months Ended								12 Months Ended
	Sep. 30, 2011 USD ($)	Mar. 31, 2011 USD ($)	Sep. 30, 2011 USD ($)	Oct. 17, 2011 USD ($)	Sep. 30, 2011 EUR (€)	Sep. 30, 2010 USD ($)	Sep. 30, 2011 Matures in August 2016 [Member] Euro based variable rate term loan [Member] International Propane [Member] EUR (€)	Sep. 30, 2011 Matures in September 2016 Euro based variable rate term loan [Member] International Propane [Member] EUR (€)	Sep. 30, 2011 Maturity Date 2014 [Member] Euro based variable rate term loan [Member] International Propane [Member] USD ($)	Sep. 30, 2011 Maturity Date 2014 [Member] Euro based variable rate term loan [Member] International Propane [Member] EUR (€)	Sep. 30, 2010 Maturity Date 2014 [Member] Euro based variable rate term loan [Member] International Propane [Member] USD ($)	Sep. 30, 2010 Maturity Date 2014 [Member] Euro based variable rate term loan [Member] International Propane [Member] EUR (€)	Sep. 30, 2011 Maturity Date 2014 [Member] Euro based variable rate term loan [Member] International Propane [Member] Maximum [Member]	Sep. 30, 2011 Maturity Date 2014 [Member] Euro based variable rate term loan [Member] International Propane [Member] Minimum [Member]	Sep. 30, 2011 Maturity Date 2011 [Member] Euro based variable rate term loan [Member] International Propane [Member]	Sep. 30, 2011 AmeriGas Propane [Member] 6.50%, Due May 2021 [Member]	Sep. 30, 2011 AmeriGas Propane [Member] 6.25%, Due August 2019 [Member]	Sep. 30, 2011 Letter Of Credit [Member] AmeriGas 2011 Credit Agreement [Member] USD ($)	Sep. 30, 2011 Letter Of Credit [Member] UGI Utilities 2011 Credit Agreement [Member] USD ($)	Sep. 30, 2011 Letter Of Credit [Member] Energy services credit agreement [Member] USD ($)	Sep. 30, 2011 Variable Rate Term Loan [Member] Antargaz 2011 Senior Facilities [Member] EUR (€)	Sep. 30, 2011 Variable Rate Term Loan [Member] Antargaz 2011 Senior Facilities [Member] EUR (€)	Sep. 30, 2010 Variable Rate Term Loan [Member] Flaga predecessor multi-currency facilities [Member] EUR (€)	Sep. 30, 2011 Revolving Credit Facility [Member] Antargaz 2011 Senior Facilities [Member] EUR (€)	Mar. 31, 2011 6.50%, Due May 2021 [Member] USD ($)	Mar. 31, 2011 7.25%, Due, May 2015 [Member] USD ($)	Mar. 31, 2011 8.875%, Due May 2011 [Member] USD ($)	Aug. 31, 2011 6.25%, Due August 2019 [Member] USD ($)	Aug. 31, 2011 7.125%, Due May 2016 [Member] USD ($)	Sep. 30, 2011 Euro based variable rate term loan [Member] International Propane [Member] EUR (€)	Sep. 30, 2010 Euro based variable rate term loan [Member] International Propane [Member]	Sep. 30, 2011 Euro based variable rate term loan [Member] International Propane [Member] Maximum [Member]	Sep. 30, 2011 Euro based variable rate term loan [Member] International Propane [Member] Minimum [Member]	Sep. 30, 2011 AmeriGas 2011 Credit Agreement [Member] USD ($)	Sep. 30, 2011 AmeriGas 2011 Credit Agreement [Member] Maximum [Member]	Sep. 30, 2011 AmeriGas 2011 Credit Agreement [Member] Minimum [Member]	Sep. 30, 2011 Existing Revolving Credit Agreement [Member] USD ($)	Sep. 30, 2011 Supplemented Credit Agreement Member] USD ($)	Sep. 30, 2011 Antargaz 2011 Senior Facilities [Member]	Sep. 30, 2010 Antargaz 2011 Senior Facilities [Member] USD ($)	Sep. 30, 2010 Antargaz 2011 Senior Facilities [Member] EUR (€)	Sep. 30, 2011 Antargaz 2011 Senior Facilities [Member] Maximum [Member]	Sep. 30, 2011 Antargaz 2011 Senior Facilities [Member] Minimum [Member]	Sep. 30, 2010 AmeriGas Predecessor Credit Agreement [Member] USD ($)	Sep. 30, 2011 Flaga multi-currency working capital facility [Member] EUR (€)	Sep. 30, 2011 Flaga predecessor multi-currency facilities [Member] EUR (€)	Sep. 30, 2011 Flaga 2011 multi currency working capital facility and predecessor agreements [Member] USD ($)	Sep. 30, 2011 Flaga 2011 multi currency working capital facility and predecessor agreements [Member] EUR (€)	Sep. 30, 2010 Flaga 2011 multi currency working capital facility and predecessor agreements [Member] USD ($)	Sep. 30, 2010 Flaga 2011 multi currency working capital facility and predecessor agreements [Member] EUR (€)	Sep. 30, 2011 Flaga 2011 multi currency working capital facility [Member] EUR (€)	Sep. 30, 2011 Flaga euro-denominated working capital facility [Member] USD ($)	Sep. 30, 2011 Flaga euro-denominated working capital facility [Member] EUR (€)	Sep. 30, 2010 Flaga euro-denominated working capital facility [Member] USD ($)	Sep. 30, 2010 Flaga euro-denominated working capital facility [Member] EUR (€)	Sep. 30, 2011 Flaga 2011 multi currency working capital facility and euro facilities [Member] USD ($)	Sep. 30, 2011 Flaga 2011 multi currency working capital facility and euro facilities [Member] EUR (€)	Sep. 30, 2010 Flaga 2011 multi currency working capital facility and euro facilities [Member] USD ($)	Sep. 30, 2010 Flaga 2011 multi currency working capital facility and euro facilities [Member] EUR (€)	Sep. 30, 2011 UGI Utilities 2011 Credit Agreement [Member] USD ($)	Sep. 30, 2010 UGI Utilities 2011 Credit Agreement [Member] USD ($)	Sep. 30, 2011 UGI Utilities 2011 Credit Agreement [Member] Maximum [Member]	Sep. 30, 2011 UGI Utilities 2011 Credit Agreement [Member] Minimum [Member]	Sep. 30, 2011 Energy services credit agreement [Member] USD ($)	Sep. 30, 2010 Energy services credit agreement [Member] USD ($)	Sep. 30, 2011 International Propane [Member] EUR (€)
Debt Instrument (Textual) [Abstract]
Term period of senior facilities agreement																																							5 years
Proceeds from issuance of senior notes																					€ 380				$ 470			$ 450
Repayments of Senior Debt	350.0																									415.0	14.6		350.0
Loss on extinguishments of debt	19.3	18.8	38.1
Reduction in net income attributable to UGI Corporation due to extinguishment loss	5.2	5.2
Percentage of redemption at option																35.00%	35.00%
Borrowing capacity under revolving credit agreement							26.7	13.3																						40.0
Credit agreement				500.0																			24.0	40.0										325.0											46.0	24.0					6.0		12.0							300.0				170.0
Revolving credit agreement sublimit for letters of credit																		100	100	50
Borrowing capacity of credit agreement terminated																																					200	75
Base rate for revolving credit agreement																																		Higher of the Federal Funds rate plus 0.50% or the agent bank’s prime rate
Interest rate for credit agreement																																		Base rate plus a margin or at a two-week, one-, two-, three-, or six-month Eurodollar Rate																										LIBOR and bank's prime rate plus a margin
Margin on credit agreement base rate borrowings													3.50%	2.625%																		3.93%	1.58%		1.75%	0.75%						2.50%	1.75%																			2.00%	0.00%
Margin on credit agreement Eurodollar rate borrowings																																			2.75%	1.75%
Credit agreement facility fee rate																																			0.50%	0.30%
Carrying value long-term debt	2,157.7		2,157.7			2,005.8			5.6	4.2	7.6	5.6
Borrowings outstanding, amount																																		95.5						68.2	50.0			91.0			5.7	4.3	13.4	9.8		10.7	8.0	10.8	7.9					0	17.0			10.0	0
Interest rate on credit agreements									5.04%	5.04%	5.03%	5.03%																						2.29%										1.31%	3.39%									2.91%	2.91%						3.25%
Credit agreement outstanding, amount																																		35.7										35.7												16.2	12.1	7.4	5.4	2.0
Maturities under term loan, May 2014	56.6		56.6																		38.0	38.0
Maturities under term loan, May 2015	69.0		69.0																		34.2	34.2
Maturities under term loan, March 2016	714.6		714.6																		307.8	307.8
Effective underlying EURIBOR rate of interest on term loan									2.16%	2.16%					3.91%							2.45%								2.68%
Effective underlying EURIBOR rate of interest on term loan after September 2015																						3.71%
Effective interest rate on term loan																					4.66%	4.66%								4.76%	4.21%
Date of expiration																																													41883							40969	40969							42278				41487
Existing revolving credit arrangement termination amount																																																												350
Ratio of consolidated debt to consolidated capital																																																												0.65
Ratio of consolidated total indebtedness to EBITDA																																																																2.00
Rate of Interest above LIBOR Rate																																																																3.00%
Rate of interest above Alternate Base Rate																																																																2.00%
Rate of interest above Federal fund Rate																																																																0.50%
Rate of interest above one month LIBOR Rate																																																																1.00%
Semi annual principal payments due																																																																		0.7
Minimum consolidated total indebtedness for maximum ratio of Consolidated total indebtedness to Consolidated total capitalization																																																																250
Minimum Consolidated Net Worth, for Maximum Ratio of Consolidated Total Indebtedness to Consolidated Total Capitalization																																																																150
Ratio of net debt to EBITDA			3.50
Payments guaranteed by UGI					100
Debt Instrument (Additional Textual) [Abstract]
Receivables securitization facility under energy services	200		200
Amount of net assets restricted from transfer to UGI under different agreements	$ 1,700		$ 1,700