Debt Instrument, Variable Rate Floor

No definition available.

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

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
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_DebtInstrumentLineItems
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04.(a))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

+ Details

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

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04.(a))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

+ Details

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

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

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

Debt - Schedule of Long-term Debt (Footnotes) (Details) € in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2017 EUR (€)	Sep. 30, 2016	Sep. 30, 2017 USD ($)
Debt Instrument
Principal repayments due April 30, 2018			$ 575.4
Principal repayments due April 30, 2019			58.2
Principal repayments due April 30, 2020			22.5
AmeriGas Propane
Debt Instrument
Principal repayments due April 30, 2018			7.5
Principal repayments due April 30, 2019			3.2
Principal repayments due April 30, 2020			$ 1.2
AmeriGas Propane \| Senior Secured Notes \| HOLP Senior Secured Notes
Debt Instrument
Effective interest rate	6.75%	6.75%	6.75%
France SAS \| France SAS Senior Facilities term loan, due through April 2020 \| EURIBOR
Debt Instrument
Variable interest rate floor (percentage)	0.00%
Basis spread on variable rate (percentage)	1.90%	1.90%
France SAS \| France SAS Senior Facilities term loan, due through April 2020 \| EURIBOR \| Minimum
Debt Instrument
Basis spread on variable rate (percentage)	1.60%
France SAS \| France SAS Senior Facilities term loan, due through April 2020 \| EURIBOR \| Maximum
Debt Instrument
Basis spread on variable rate (percentage)	2.70%
France SAS \| France SAS Senior Facilities term loan, due through April 2020 \| Interest rate swaps \| EURIBOR
Debt Instrument
Underlying fixed interest rate (percentage)	0.18%		0.18%
France SAS \| Term Loan \| France SAS Senior Facilities term loan, due through April 2020
Debt Instrument
Principal repayments due April 30, 2018 \| €	€ 60
Principal repayments due April 30, 2019 \| €	60
Principal repayments due April 30, 2020 \| €	€ 480
France SAS \| Term Loan \| France SAS Senior Facilities term loan, due through April 2020 \| EURIBOR
Debt Instrument
Effective interest rate	2.10%	2.10%	2.10%
Flaga \| Term Loan \| Flaga Credit Facility Agreement
Debt Instrument
Effective interest rate	1.80%	2.11%	1.80%
Flaga \| Term Loan \| Flaga Credit Facility Agreement \| Three-Month EURIBOR \| Minimum
Debt Instrument
Basis spread on variable rate (percentage)	1.20%
Flaga \| Term Loan \| Flaga Credit Facility Agreement \| Three-Month EURIBOR \| Maximum
Debt Instrument
Basis spread on variable rate (percentage)	2.60%
Flaga \| Term Loan \| Flaga Credit Facility Agreement \| Interest rate swaps \| Three-Month EURIBOR
Debt Instrument
Underlying fixed interest rate (percentage)	0.23%		0.23%
Flaga \| Term Loan \| Flaga Term Loan, due September 2018 \| One-Month LIBOR
Debt Instrument
Basis spread on variable rate (percentage)	1.125%
Flaga \| Term Loan \| Flaga Term Loan, due September 2018 \| Cross-currency swaps \| One-Month LIBOR
Debt Instrument
Effective interest rate	0.87%	0.87%	0.87%