Average remaining depreciable lives of associated property.

No definition available.

Name:	ugi_AverageRemainingDepreciableLivesOfAssociatedProperty
Namespace Prefix:	ugi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Distribution System Improvement Charge, Percent of Amount Billed to Customers

+ References

No definition available.

+ Details

Name:	ugi_DistributionSystemImprovementChargePercentofAmountBilledtoCustomers
Namespace Prefix:	ugi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

PUC Temporary Rates Order, Percent of Reduction In Base Rate Revenues

+ References

No definition available.

+ Details

Name:	ugi_PUCTemporaryRatesOrderPercentofReductionInBaseRateRevenues
Namespace Prefix:	ugi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

PUC Temporary Rates Order, Reduction In Revenue

+ References

No definition available.

+ Details

Name:	ugi_PUCTemporaryRatesOrderReductionInRevenue
Namespace Prefix:	ugi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611

+ Details

Name:	us-gaap_DerivativeFairValueOfDerivativeNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of public utility's approved rate increase (decrease) by regulatory agency.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesApprovedRateIncreaseDecreaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of public utility's requested rate increase (decrease) with regulatory agency.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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

Name:	us-gaap_RegulatoryAssetLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382

+ Details

Name:	us-gaap_RegulatoryAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	dei_LegalEntityAxis=ugi_PNGMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=ugi_UGIGasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=ugi_CPGMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=ugi_UgiUtilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RegulatoryAgencyAxis=ugi_PennsylvaniaPublicUtilityCommissionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=ugi_ElectricUtilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RegulatoryAssetAxis=ugi_GasUtilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RegulatoryAssetAxis=ugi_IncomeTaxBenefitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RegulatoryAssetAxis=ugi_FutureAmortizationOfRegulatoryLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=ugi_FinancialTransmissionRightsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Utility Regulatory Assets and Liabilities and Regulatory Matters - Narrative (Details) - USD ($) $ in Millions										1 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2018	May 17, 2018	Jan. 26, 2018	Oct. 20, 2017	Jul. 01, 2017	Jan. 01, 2017	Oct. 19, 2016	Apr. 01, 2016	Apr. 01, 2015	Mar. 31, 2018	Jun. 30, 2018	Jun. 30, 2018	Sep. 30, 2014	Sep. 30, 2017	Jun. 30, 2017
PNG
Regulatory Assets
PUC temporary rates order, percent of reduction in base rate revenues		3.90%
UGI Gas
Regulatory Assets
PUC temporary rates order, percent of reduction in base rate revenues		5.78%
CPG
Regulatory Assets
PUC temporary rates order, percent of reduction in base rate revenues		8.19%
UGI Utilities
Regulatory Assets
PUC temporary rates order, reduction in revenue										$ 1.4	$ 22.7	$ 24.1
Regulatory assets	$ 360.1										360.1	$ 360.1		$ 368.9	$ 398.8
Minimum
Regulatory Assets
Average remaining depreciable lives of associated property.												1 year
Maximum
Regulatory Assets
Average remaining depreciable lives of associated property.												65 years
Pennsylvania Public Utility Commission
Regulatory Assets
DSIC, percent of amount billed to customers													0.00%
Pennsylvania Public Utility Commission \| Electric Utility
Regulatory Assets
Requested rate increase amount	7.7		$ 9.2
Pennsylvania Public Utility Commission \| PNG
Regulatory Assets
Increase in annual base distribution rate				$ 11.3
DSIC, percent of amount billed to customers					7.50%				0.00%			0.00%
Pennsylvania Public Utility Commission \| UGI Gas
Regulatory Assets
Increase in annual base distribution rate							$ 27.0
Pennsylvania Public Utility Commission \| CPG
Regulatory Assets
DSIC, percent of amount billed to customers					7.50%			0.00%
Pennsylvania Public Utility Commission \| Maximum
Regulatory Assets
DSIC, percent of amount billed to customers						5.00%
Gas Utility
Regulatory Assets
Fair value of unrealized gains (losses)	$ 1.9										$ 1.9	$ 1.9		$ 0.1	(0.1)
Income Tax Benefits \| UGI Utilities
Regulatory Assets
PUC temporary rates order, reduction in revenue												17.1
Future Amortization Of Regulatory Liabilities \| UGI Utilities
Regulatory Assets
PUC temporary rates order, reduction in revenue												$ 7.0
Financial Transmission Rights \| Gas Utility
Regulatory Assets
Fair value of unrealized gains (losses)															$ 0.0