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

No definition available.

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ 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

+ Details

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

- Definition

Gross amount of debt extinguished.

+ References

No definition available.

+ Details

Name:	us-gaap_ExtinguishmentOfDebtAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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

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 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

+ Details

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

Debt - AmeriGas Propane (Details) - USD ($)	1 Months Ended	12 Months Ended
Debt - AmeriGas Propane (Details) - USD ($)	Dec. 31, 2017	Sep. 30, 2017	Sep. 30, 2016
AmeriGas Partners
Debt Instrument
Aggregate principal amount of tendered notes redeemed			$ 1,270,000,000
AmeriGas Partners \| Senior Notes \| 5.50% due May 2025
Debt Instrument
Aggregate principal amount		$ 700,000,000
Stated interest rate		5.50%
AmeriGas Partners \| Senior Notes \| 5.75% due May 2027
Debt Instrument
Aggregate principal amount		$ 525,000,000
Stated interest rate		5.75%
AmeriGas Partners \| Senior Notes \| 7.00% Senior Notes
Debt Instrument
Stated interest rate		7.00%
Aggregate principal balance repaid		$ 980,800,000
AmeriGas Partners \| Senior Notes \| 5.625% due May 2024
Debt Instrument
Aggregate principal amount			$ 675,000,000
Stated interest rate			5.625%
AmeriGas Partners \| Senior Notes \| 5.875% due August 2026
Debt Instrument
Aggregate principal amount			$ 675,000,000
Stated interest rate			5.875%
AmeriGas Partners \| Senior Notes \| 6.50% Senior Notes, due 2021
Debt Instrument
Stated interest rate			6.50%
AmeriGas Partners \| Senior Notes \| 6.75% Senior Notes, due 2020
Debt Instrument
Stated interest rate			6.75%
AmeriGas Partners \| Senior Notes \| 6.25% Senior Notes, due 2019
Debt Instrument
Stated interest rate			6.25%
Revolving Credit Facility \| Line of Credit \| AmeriGas Credit Agreement
Debt Instrument
Total capacity	$ 600,000,000
Letter of Credit \| Line of Credit \| AmeriGas Credit Agreement
Debt Instrument
Total capacity	$ 150,000,000
Federal Funds Effective Swap Rate \| AmeriGas Credit Agreement
Debt Instrument
Basis spread on variable rate (percentage)	0.50%
Minimum \| Base Rate \| AmeriGas Credit Agreement
Debt Instrument
Basis spread on variable rate (percentage)	0.50%
Minimum \| Eurodollar \| AmeriGas Credit Agreement
Debt Instrument
Basis spread on variable rate (percentage)	1.50%
Maximum \| Base Rate \| AmeriGas Credit Agreement
Debt Instrument
Basis spread on variable rate (percentage)	1.75%
Maximum \| Eurodollar \| AmeriGas Credit Agreement
Debt Instrument
Basis spread on variable rate (percentage)	2.75%