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Debt (Details Textual) (USD $) In Millions, unless otherwise specified | 6 Months Ended
--- | ---
Mar. 31, 2013
Debt Instrument [Line Items] |
Potential Increase to borrowing capacity | $ 30
Borrowing capacity potential increase | 270
Energy Services Credit Agreement [Member] |
Debt Instrument [Line Items] |
Line of Credit Facility, Maximum Borrowing Capacity | 240
Ratio of Consolidated Indebtedness to EBITDA | 2.25
Minimum Consolidated Indebtedness | 250
Minimum Consolidated Net Worth | 200
Energy Services Credit Agreement [Member] | Letter of Credit [Member] |
Debt Instrument [Line Items] |
Revolving Credit Agreement Sublimit for Letters of Credit | $ 50

X
- Definition Borrowing potential revised borrowing capacity upon request and approval of certain banks. + References No definition available. + Details
Name: | ugi_BorrowingCapacityPotentialIncrease
Namespace Prefix: | ugi_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum consolidated indebtedness. + References No definition available. + Details
Name: | ugi_MinimumConsolidatedIndebtedness
Namespace Prefix: | ugi_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum Consolidated Net worth for maximum ratio of consolidated totals indebtedness to consolidated total capitalization. + References No definition available. + Details
Name: | ugi_MinimumConsolidatedNetWorth
Namespace Prefix: | ugi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Additional amount that could be added to the total borrowing capacity under the the current credit agreement. + References No definition available. + Details
Name: | ugi_PotentialIncreaseToBorrowingCapacity
Namespace Prefix: | ugi_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Ratio of consolidated total indebtedness to EBITDA. + References No definition available. + Details
Name: | ugi_RatioOfConsolidatedIndebtednessToEbitda
Namespace Prefix: | ugi_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition Revolving credit agreement sublimit for letters of credit. + References No definition available. + Details
Name: | ugi_RevolvingCreditAgreementSublimitForLettersOfCredit
Namespace Prefix: | ugi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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 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 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 Reference 3: 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_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant