The amount of (gain) loss recognized from change in fair value of equity used to redeem debt during the period.

No definition available.

Name:	fgp_ChangeInFairValueOfEquityUsedToRedeemDebt
Namespace Prefix:	fgp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The available borrowing capacity, as a percentage of the Borrowing Base, necessary, under the debt covenant, for cash distributions.

+ References

No definition available.

+ Details

Name:	fgp_DebtCovenantAvailableCapacityAsPercentageOfBorrowingBaseRequiredForDistributions
Namespace Prefix:	fgp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The available borrowing capacity necessary, under the debt covenant, for cash distributions.

+ References

No definition available.

+ Details

Name:	fgp_DebtCovenantAvailableCapacityRequiredForDistributions
Namespace Prefix:	fgp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The required ratio of trailing four quarters EBITDA to interest expense, under the indenture governing the debt securities. Compliance status entitles, or prevents, the entity from taking certain actions.

+ References

No definition available.

+ Details

Name:	fgp_DebtSecuritiesRequiredFixedChargeCoverageRatio
Namespace Prefix:	fgp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of quarters EBITDA used in the required fixed charge coverage ratio.

+ References

No definition available.

+ Details

Name:	fgp_DebtSecuritiesRequiredFixedChargeCoverageRatioMeasurementPeriodNumberOfQuarters
Namespace Prefix:	fgp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of make-whole payments attributable to extinguishment of debt during the period.

+ References

No definition available.

+ Details

Name:	fgp_ExtinguishmentOfDebtMakeWholePayment
Namespace Prefix:	fgp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of redemption premium attributable to extinguishment of debt during the period.

+ References

No definition available.

+ Details

Name:	fgp_ExtinguishmentOfDebtRedemptionPremium
Namespace Prefix:	fgp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The ratio of adjusted EBITDA to cash interest expense.

+ References

No definition available.

+ Details

Name:	fgp_InterestCoverageRatio
Namespace Prefix:	fgp_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

The ratio of secured indebtedness to adjusted EBITDA.

+ References

No definition available.

+ Details

Name:	fgp_SecuredLeverageRatio
Namespace Prefix:	fgp_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

The ratio of total indebtedness, net of restricted cash, to adjusted EBITDA.

+ References

No definition available.

+ Details

Name:	fgp_TotalNetLeverageRatio
Namespace Prefix:	fgp_
Data Type:	xbrli:pureItemType
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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69C
-URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69B
-URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612

+ Details

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

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123467658&loc=d3e12355-112629

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=123467658&loc=d3e12317-112629

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

+ Details

Name:	us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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://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(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&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 inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ 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=123570139&loc=d3e3255-108585

+ Details

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

- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227

+ Details

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

- Details

Name:	us-gaap_DebtInstrumentAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=fgp_SeniorNotes5.375PercentDue2026AndSeniorNotes5.875PercentDue2029Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=fgp_SeniorNotes5.375PercentDue2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=fgp_SeniorNotes5.875PercentDue2029Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=fgp_DebtCovenantFirstSpecifiedPeriodMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=fgp_DebtCovenantSecondSpecifiedPeriodMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=fgp_DebtCovenantThirdSpecifiedPeriodMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=fgp_DebtCovenantFourthSpecifiedPeriodMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

Debt - Covenants and Loss on Extinguishment (Details) $ in Thousands		12 Months Ended
	Mar. 30, 2021 USD ($)	Jul. 31, 2022 USD ($) item	Jul. 31, 2021 USD ($)	Jul. 31, 2020 USD ($)
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt		$ 0	$ 1,475,000	$ 703,750
Total loss on extinguishment of debt		$ 0	104,834	37,399
Payment of redemption premium on debt extinguishment			83,072
Fair value of Class B Units in excess of carrying value			(5,101)
Make-whole payments			1,964
Unamortized deferred financing costs			24,899
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Term	4 years
Line of Credit Facility, Maximum Borrowing Capacity	$ 350,000
Senior Notes 5.375 Percent Due 2026 And Senior Notes 5.875 Percent Due 2029 [Member]
Debt Instrument [Line Items]
Number of quarters for required fixed charge coverage ratio \| item		4
Proceeds from issuance of long-term debt	1,441,200
Senior Notes 5.375 Percent Due 2026 [Member]
Debt Instrument [Line Items]
Aggregate principal amount	650,000
Senior Notes 5.875 Percent Due 2029 [Member]
Debt Instrument [Line Items]
Aggregate principal amount	825,000
Maximum [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Secured leverage ratio		2.50
Maximum [Member] \| Senior Notes 5.375 Percent Due 2026 And Senior Notes 5.875 Percent Due 2029 [Member]
Debt Instrument [Line Items]
Total net leverage ratio		5.0
Required fixed charge coverage ratio		1.75%
Maximum [Member] \| Debt Covenant, First Specified Period [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total net leverage ratio		5.50
Maximum [Member] \| Debt Covenant, Second Specified Period [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total net leverage ratio		5.25
Maximum [Member] \| Debt Covenant, Third Specified Period [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total net leverage ratio		5.0
Maximum [Member] \| Debt Covenant, Fourth Specified Period [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total net leverage ratio		4.75
Minimum [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Interest coverage ratio		2.50
Available capacity necessary for cash distributions		$ 50,000
Available capacity as percentage of Borrowing Base, necessary for cash distributions		15.00%
Ferrellgas, L.P. [Member]
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt			1,475,000	703,750
Total loss on extinguishment of debt			107,971	$ 37,399
Payment of redemption premium on debt extinguishment			83,072
Unamortized deferred financing costs			$ 24,899
Ferrellgas, L.P. [Member] \| Senior Notes 5.375 Percent Due 2026 [Member]
Debt Instrument [Line Items]
Aggregate principal amount	650,000
Ferrellgas, L.P. [Member] \| Senior Notes 5.875 Percent Due 2029 [Member]
Debt Instrument [Line Items]
Aggregate principal amount	$ 825,000