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Condensed Financial Information of Registrant (Parent Company) (Details)	12 Months Ended
	Sep. 30, 2016 USD ($)
Parent Company
Guarantee Obligations
Surety bonds indemnified	$ 70,000,000
Maximum amount authorized to guarantee obligations to suppliers and customers	500,000,000
Current carrying value	459,400,000
Flaga
Guarantee Obligations
Amount of floating to fixed rate interest rate swaps at Flaga	$ 1,200,000

X

- Definition

Amount of floating to fixed rate interest rate swaps.

+ References

No definition available.

+ Details

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Namespace Prefix:	ugi_
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Balance Type:	credit
Period Type:	instant

X

- Definition

Maximum amount authorized to guarantee obligations to suppliers and customers.

+ References

No definition available.

+ Details

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Namespace Prefix:	ugi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Surety bonds indemnified.

+ References

No definition available.

+ Details

Name:	ugi_SuretyBondsIndemnified
Namespace Prefix:	ugi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

X

- 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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Namespace Prefix:	us-gaap_
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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: