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Debt - Schedule of Receivables Facility (Details) - Energy Services - Receivables Facility - Energy Services Receivables Facility - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Short-term Debt
Trade receivables transferred to ESFC during the year	$ 1,372.7	$ 1,279.5	$ 1,017.3
ESFC trade receivables sold to the bank during the year	179.0	193.0	243.0
ESFC trade receivables - end of year	54.5	65.0	$ 44.8
Outstanding balance of trade receivables sold	$ 46.4	$ 2.0

X

- Definition

Outstanding balance of ESFC trade receivables.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

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- Definition

Sale of trade receivables to consolidated special purpose subsidiary.

+ References

No definition available.

+ Details

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- Definition

Trade receivables sold to commercial paper conduit.

+ References

No definition available.

+ Details

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Namespace Prefix:	ugi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Proceeds from securitizations of receivables treated as collateralized borrowings, which are classified as financing transactions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585

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- 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.

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- Details

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- Details

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- Details

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