Partners' Capital (Narrative) (Details) (USD $)	3 Months Ended
	Oct. 31, 2011	Oct. 31, 2010
Distribution Made to Member or Limited Partner [Line Items]
Cash distribution declared date	November 22, 2011
Cash distributions declared per common unit	$ 0.50
Cash distributions, payment date	December 15, 2011
Ferrellgas, L.P. And Subsidiaries [Member]
Distribution Made to Member or Limited Partner [Line Items]
Cash distribution declared date	November 22, 2011
Cash distributions, payment date	December 15, 2011
Ferrellgas Partners [Member] | Ferrellgas, L.P. And Subsidiaries [Member]
Distribution Made to Member or Limited Partner [Line Items]
Distribution payable, amount	$ 46,200,000
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%
Cash received from contributions		39,000
Non-cash contributions	100,000	69,000
General Partner [Member] | Ferrellgas, L.P. And Subsidiaries [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%
Distribution payable, amount	500,000
Cash received from contributions		20,000
Non-cash contributions	$ 55,000	$ 35,000