Preferred units - Restrictions on Cash Distributions (Details) $ in Millions	Jul. 31, 2022 USD ($)
Temporary Equity [Line Items]
Minimum liquidity	$ 100
Period Through May 15, 2022 [Member]
Temporary Equity [Line Items]
Consolidated net leverage ratio	7.25
Period Thereafter [Member]
Temporary Equity [Line Items]
Consolidated net leverage ratio	7.00

Represents consolidated net leverage ratio (ratio of the operating partnership's consolidated total net debt (including the total redemption price of all outstanding Preferred Units and PIK Units but excluding certain letters of credit and capital lease obligations) as of each Quarterly Distribution Date to trailing four quarters consolidated EBITDA.

No definition available.

Name:	fgp_OperatingPartnershipCovenantsConsolidatedNetLeverageRatio
Namespace Prefix:	fgp_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant