The divisor applied to the percentage of taxable income allocation to determine maximum additional distribution.

No definition available.

Name:	fgp_AdditionalDistributionToBlockerDivisorAppliedToTaxableIncome
Namespace Prefix:	fgp_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage applied to the taxable income allocated to a blocker in the calculation to determine the maximum additional distribution.

+ References

No definition available.

+ Details

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

- Definition

The cash tax distribution stated rate.

+ References

No definition available.

+ Details

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

- Definition

Cash tax distribution rate calculated as tax rate multiplied by estimated taxable income percentage.

+ References

No definition available.

+ Details

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

- Definition

Additional amounts payable pursuant to side letters in relation to preferred units.

+ References

No definition available.

+ Details

Name:	fgp_PreferredUnitsAdditionalAmountsPayablePursuantToSideLetters
Namespace Prefix:	fgp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of additional quarterly distribution accrued.

+ References

No definition available.

+ Details

Name:	fgp_PreferredUnitsAdditionalQuarterlyDistributionAccrued
Namespace Prefix:	fgp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The percentage basis point premium added to the distribution rate on preferred units.

+ References

No definition available.

+ Details

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

- Definition

The percentage rate used to calculate the distribution on preferred units.

+ References

No definition available.

+ Details

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

- Definition

The amount of quarterly distribution accrued.

+ References

No definition available.

+ Details

Name:	fgp_PreferredUnitsQuarterlyDistributionAccrued
Namespace Prefix:	fgp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash outflow from distributions to temporary equity holders during the period.

+ References

No definition available.

+ Details

Name:	fgp_TemporaryEquityDistribution
Namespace Prefix:	fgp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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

- Details

Name:	srt_RangeAxis=srt_MinimumMember
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_FirstFiveYearsAfterMarch302021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Preferred units - Distributions (Details) - USD ($) $ in Thousands							9 Months Ended
	May 15, 2025	Feb. 15, 2025	Nov. 15, 2024	May 15, 2024	Feb. 15, 2024	Nov. 15, 2023	Apr. 30, 2025	Apr. 30, 2024
Preferred units
Quarterly distribution accrued							$ 17,000	$ 16,900
Cash distribution	$ 15,400	$ 15,400	$ 15,400	$ 15,400	$ 15,400	$ 15,400	48,737	49,141
Preferred units additional quarterly distribution accrued							1,600	1,500
Preferred units additional amounts payable pursuant to side letters							$ 1,600	$ 2,000
Cash tax distribution rate							25.00%
Tax rate multiplied by estimated taxable income percentage							0.25%
Additional distribution, percentage of taxable income							20.00%
Additional distribution, divisor							0.8
Minimum
Preferred units
Applicable premium distribution rate							0.75
Maximum
Preferred units
Applicable premium distribution rate							3
First Five Years After March 30, 2021 \| Minimum
Preferred units
Preferred units distribution rate							8.956%
First Five Years After March 30, 2021 \| Maximum
Preferred units
Preferred units distribution rate							11.125%