Partners' Deficit - Limited Partner Units (Details) - shares	Jul. 31, 2019	Jul. 31, 2018
Capital Unit [Line Items]
Common unitholders, units outstanding	97,152,665	97,152,665
Ferrell Companies [Member]
Capital Unit [Line Items]
Common unitholders, units outstanding	22,529,361	22,529,361
FCI Trading Corp. [Member]
Capital Unit [Line Items]
Common unitholders, units outstanding	195,686	195,686
Ferrell Propane, Inc. [Member]
Capital Unit [Line Items]
Common unitholders, units outstanding	51,204	51,204
James E. Ferrell [Member]
Capital Unit [Line Items]
Common unitholders, units outstanding	4,763,475	4,763,475
Public Common Unitholders [Member]
Capital Unit [Line Items]
Common unitholders, units outstanding	69,612,939	69,612,939