Partners' Capital (Limited Partner Units) (Details)	12 Months Ended
	Jul. 31, 2012		Jul. 31, 2011
Limited partners units owned	79,006,619		75,966,353
Equity interest in subsidiaries common units	100.00%
Public Common Unitholders [Member]
Limited partners units owned	52,931,590	[1]	51,285,212	[1]
Ferrell Companies [Member]
Limited partners units owned	21,469,664	[2]	20,080,776	[2]
Equity interest in subsidiaries common units	27.20%
FCI Trading Corp. [Member]
Limited partners units owned	195,686	[3]	195,686	[3]
Ferrell Propane, Inc. [Member]
Limited partners units owned	51,204	[4]	51,204	[4]
James E. Ferrell [Member]
Limited partners units owned	4,358,475	[5]	4,353,475	[5]
Ferrell Companies [Member] | FCI Trading Corp. [Member]
Limited partners units owned	195,686
Ferrell Companies [Member] | Ferrell Propane, Inc. [Member]
Limited partners units owned	51,204

[1] These common units are listed on the New York Stock Exchange under the symbol “FGP.”

[2] Ferrell Companies is the owner of the general partner and a 27.2% direct owner of Ferrellgas Partner’s common units and thus a related party. Ferrell Companies also beneficially owns 195,686 and 51,204 common units of Ferrellgas Partners held by FCI Trading Corp. (“FCI T

[3] FCI Trading is an affiliate of the general partner and thus a related party.

[4] Ferrell Propane is controlled by the general partner and thus a related party.

[5] James E. Ferrell (“Mr. Ferrell”) is the Executive Chairman and Chairman of the Board of Directors of the general partner and thus a related party.