Partners' Capital (Limited Partner Units) (Details)	Jul. 31, 2013	Jul. 31, 2012
Capital Unit [Line Items]
Common unitholders, units outstanding	79,072,819	79,006,619
Public Common Unitholders [Member]
Capital Unit [Line Items]
Common unitholders, units outstanding	52,997,790	52,931,590
Ferrell Companies [Member]
Capital Unit [Line Items]
Common unitholders, units outstanding	21,469,664	21,469,664
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	4,358,475	4,358,475