Partners' Capital (Narrative) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended									0 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2014 Ferrellgas, L.P. [Member]	Oct. 31, 2013 Ferrellgas, L.P. [Member]	Oct. 31, 2014 Ferrellgas Partners [Member] Ferrellgas, L.P. [Member]	Oct. 31, 2014 General Partner [Member]	Oct. 31, 2013 General Partner [Member]	Oct. 31, 2014 General Partner [Member] Ferrellgas, L.P. [Member]	Oct. 31, 2013 General Partner [Member] Ferrellgas, L.P. [Member]	Dec. 15, 2014 Subsequent Event [Member]	Nov. 25, 2014 Subsequent Event [Member]	Dec. 15, 2014 Subsequent Event [Member] Ferrellgas, L.P. [Member]	Nov. 25, 2014 Subsequent Event [Member] Ferrellgas, L.P. [Member]	Dec. 15, 2014 Subsequent Event [Member] Ferrellgas Partners [Member] Ferrellgas, L.P. [Member]	Dec. 15, 2014 Subsequent Event [Member] General Partner [Member]	Dec. 15, 2014 Subsequent Event [Member] General Partner [Member] Ferrellgas, L.P. [Member]
Capital Unit [Line Items]
Limited partner ownership interest	27.20%
Cash distribution declaration date											Nov. 25, 2014		Nov. 25, 2014
Cash distributions declared per common unit											$ 0.50
Cash distributions to related parties														$ 49,600,000	$ 418,000	$ 500,000
Cash distributions payment date										Dec. 15, 2014		Dec. 15, 2014
General partner ownership interest	1.00%		1.00%			2.00%		1.0101%
Contributions from partners	424,000	0	42,655,000	0	42,200,000	900,000		400,000
Non-cash contributions						400,000	200,000	200,000	100,000
Stock Issued During Period, Shares, Treasury Stock Reissued	1.5
Stock Issued During Period, Value, Other	$ 42,000,000