Partners' Capital (Deficit) Partners' Capital (Limited Partner Units) (Details) - shares	Jan. 31, 2017	Jul. 31, 2016
Related Party Transaction [Line Items]
Limited Partners' Capital Account, Units Outstanding	97,152,665	98,002,665
Public Common Unitholders [Member]
Related Party Transaction [Line Items]
Limited Partners' Capital Account, Units Outstanding	69,612,939	70,462,939
FCI Trading Corp. [Member]
Related Party Transaction [Line Items]
Limited Partners' Capital Account, Units Outstanding	195,686	195,686
Subsidiary of Common Parent [Member]
Related Party Transaction [Line Items]
Limited Partners' Capital Account, Units Outstanding	22,529,361	22,529,361
Ferrell Propane, Inc [Member]
Related Party Transaction [Line Items]
Limited Partners' Capital Account, Units Outstanding	51,204	51,204
James E. Ferrell [Member]
Related Party Transaction [Line Items]
Limited Partners' Capital Account, Units Outstanding	4,763,475	4,763,475