Partners' Capital (Narrative) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended	6 Months Ended
	Jan. 31, 2012	Jan. 31, 2012	Jan. 31, 2012	Jan. 31, 2011
Distribution Made to Member or Limited Partner [Line Items]
Direct offering of common units, shares	1.5
Proceeds from direct offering of common units	$ 25,000,000
Stock issued during the period for acquisition, shares			0.1
Stock issued during the period for acquisition, value			1,300,000
Cash distribution declared date			February 23, 2012
Cash distributions declared per common unit		$ 0.50
Cash distributions, payment date			March 16, 2012
Cash received from contributions			504,000	615,000
Ferrellgas, L.P. [Member]
Distribution Made to Member or Limited Partner [Line Items]
Received cash contributions from parent	50,000,000
Asset contributions received from parent			1,300,000
Cash distribution declared date			February 23, 2012
Cash distributions, payment date			March 16, 2012
Cash received from contributions			50,510,000	30,309,000
Ferrellgas Partners [Member] | Ferrellgas, L.P. [Member]
Distribution Made to Member or Limited Partner [Line Items]
Distribution payable, amount	39,900,000	39,900,000	39,900,000
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			1,000,000
Non-cash contributions			200,000
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%
Distribution payable, amount	400,000	400,000	400,000
Cash received from contributions				500,000
Non-cash contributions				100,000
Ferrell Companies [Member]
Distribution Made to Member or Limited Partner [Line Items]
Direct offering of common units, shares	1.4
Proceeds from direct offering of common units	$ 25,000,000