Current fixed charge coverage ratio

No definition available.

Name:	fgp_Currentfixedchargecoverageratio
Namespace Prefix:	fgp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Required fixed charge coverage ratio

+ References

No definition available.

+ Details

Name:	fgp_Requiredfixedchargecoverageratio
Namespace Prefix:	fgp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure.

+ 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))
-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 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

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

- Definition

Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants.

+ References

+ Details

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

- Definition

Description of covenants that limit or prohibit certain actions or activities without the lender's prior consent within a specified period of time or until certain specified targets are achieved for example, reduction of the debt or an increase in net worth to a specified amount).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

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

- Definition

Per unit of ownership amount of cash distributions declared to unit-holder of a limited partnership (LP).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

Name:	us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Details

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

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	fgp_CovenantAxis=fgp_InterestCoverageCovenantMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	fgp_CovenantAxis=fgp_FixedChargeCoverageCovenantMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt Debt (Fixed Charge Coverage Ratio) (Details) - $ / shares	3 Months Ended		12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Distribution Made to Limited Partner, Distributions Declared, Per Unit	$ 0.10	$ 0.40		$ 2.05
Debt Instrument, Covenant Description	5.2
Required fixed charge coverage ratio	175.00%
Current fixed charge coverage ratio	144.00%
Debt Instrument, Covenant Compliance	40.6		67.5
Ferrellgas, L.P. [Member]
Distribution Made to Limited Partner, Distributions Declared, Per Unit	$ 0.40	$ 2.05
Debt Instrument, Covenant Description	5.2
Debt Instrument, Covenant Compliance	40.6		67.5
Subsequent Event [Member]
Distribution Made to Limited Partner, Distributions Declared, Per Unit	$ 0.10
Interest Coverage Covenant [Member]
Debt Instrument, Covenant Description	21.1
Debt Instrument, Covenant Compliance	12.1
Interest Coverage Covenant [Member] \| Ferrellgas, L.P. [Member]
Debt Instrument, Covenant Description	21.1
Debt Instrument, Covenant Compliance	12.1
Fixed Charge Coverage Covenant [Member]
Debt Instrument, Covenant Description	30.4
Debt Instrument, Restrictive Covenants	50.0
Debt Instrument, Covenant Compliance	9.8