Partners' Capital (Narrative) (Details) (USD $)	3 Months Ended
	Oct. 31, 2012	Oct. 31, 2011
Distribution Made to Member or Limited Partner [Line Items]
Cash distribution declared date	Nov. 20, 2012
Cash distributions declared per common unit	$ 0.50
Cash distributions, payment date	Dec. 14, 2012
Ferrellgas, L.P. [Member]
Distribution Made to Member or Limited Partner [Line Items]
Cash distribution declared date	Nov. 20, 2012
Cash distributions, payment date	Dec. 14, 2012
Ferrellgas Partners [Member] | Ferrellgas, L.P. [Member]
Distribution Made to Member or Limited Partner [Line Items]
Distribution payable, amount	$ 47,800,000
General Partner [Member]
Distribution Made to Member or Limited Partner [Line Items]
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest	2.00%	2.00%
Non-cash contributions	100,000	100,000
General Partner [Member] | Ferrellgas, L.P. [Member]
Distribution Made to Member or Limited Partner [Line Items]
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest	1.0101%	1.0101%
Distribution payable, amount	500,000
Non-cash contributions	$ 55,000	$ 55,000
Ferrell Companies [Member]
Distribution Made to Member or Limited Partner [Line Items]
Subsidiary Or Equity Method Investee Cumulative Percentage Ownership After All Transactions And Including Beneficial Ownership	27.00%