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

No definition available.

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

- Definition

The effective interest rate at the end of the reporting period.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- 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

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16)(a)(1))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_ShortTermBorrowings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

Name:	dei_LegalEntityAxis=ugi_EnergyServicesMember
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:	dei_LegalEntityAxis=ugi_UGICorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt - Schedule of Short-term Debt (Details)	Sep. 30, 2019 USD ($)	Sep. 30, 2019 EUR (€)	Aug. 13, 2019 USD ($)	Aug. 12, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2018 EUR (€)
AmeriGas OLP
Short-term Debt
Total Capacity	$ 600,000,000.0				$ 600,000,000.0
Borrowings Outstanding	328,000,000.0				232,000,000.0
Letters of Credit and Guarantees Outstanding	62,700,000				63,500,000
Available Borrowing Capacity	$ 209,300,000				$ 304,500,000
Weighted Average Interest Rate - End of Year	4.50%	4.50%			4.58%	4.58%
UGI International LLC
Short-term Debt
Total Capacity \| €		€ 300,000,000.0				€ 300,000,000.0
Borrowings Outstanding	$ 210,000,000.0	192,700,000				0
Letters of Credit and Guarantees Outstanding \| €		0				0
Available Borrowing Capacity \| €		€ 107,300,000				300,000,000.0
Weighted Average Interest Rate - End of Year	3.64%	3.64%
UGI France
Short-term Debt
Total Capacity \| €						60,000,000.0
Borrowings Outstanding \| €						0
Letters of Credit and Guarantees Outstanding \| €						0
Available Borrowing Capacity \| €						60,000,000.0
Flaga
Short-term Debt
Total Capacity \| €						55,000,000.0
Borrowings Outstanding \| €						0
Letters of Credit and Guarantees Outstanding \| €						500,000
Available Borrowing Capacity \| €						€ 54,500,000
Energy Services
Short-term Debt
Total Capacity	$ 200,000,000.0		$ 200,000,000	$ 240,000,000	$ 240,000,000.0
Borrowings Outstanding	45,000,000.0				0
Letters of Credit and Guarantees Outstanding	0				0
Available Borrowing Capacity	$ 155,000,000.0				240,000,000.0
Weighted Average Interest Rate - End of Year	6.25%	6.25%
UGI Utilities
Short-term Debt
Total Capacity	$ 350,000,000.0				450,000,000.0
Borrowings Outstanding	166,000,000.0				189,500,000
Letters of Credit and Guarantees Outstanding	0				2,000,000.0
Available Borrowing Capacity	$ 184,000,000.0				$ 258,500,000
Weighted Average Interest Rate - End of Year	3.00%	3.00%			3.03%	3.03%
UGI Corporation
Short-term Debt
Total Capacity	$ 300,000,000.0
Borrowings Outstanding	300,000,000.0
Letters of Credit and Guarantees Outstanding	0
Available Borrowing Capacity	$ 0
Weighted Average Interest Rate - End of Year	4.55%	4.55%