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| | | <HasEmbeddedReports> false </HasEmbeddedReports> |
| | | <LongName> All Reports </LongName> |
| | | <ReportType> Book </ReportType> |
| | | <ShortName> All Reports </ShortName> |
| | | </Report> |
| | </MyReports> |
| <InputFiles> |
| | <File> fgp-20230731.xsd </File> |
| | <File> fgp-20230731_cal.xml </File> |
| | <File> fgp-20230731_def.xml </File> |
| | <File> fgp-20230731_lab.xml </File> |
| | <File> fgp-20230731_pre.xml </File> |
| | <File doctype="10-K" isDefinitelyFs="true" isUsgaap="true" original="fgp-20230731x10k.htm"> fgp-20230731x10k.htm </File> |
| | </InputFiles> |
| <SupplementalFiles/> |
| <BaseTaxonomies> |
| | <BaseTaxonomy items="3"> http://fasb.org/srt/2023 </BaseTaxonomy> |
| | <BaseTaxonomy items="1609"> http://fasb.org/us-gaap/2023 </BaseTaxonomy> |
| | <BaseTaxonomy items="107"> http://xbrl.sec.gov/dei/2023 </BaseTaxonomy> |
| | </BaseTaxonomies> |
| <HasPresentationLinkbase> true </HasPresentationLinkbase> |
| <HasCalculationLinkbase> true </HasCalculationLinkbase> |
| </FilingSummary> |