Debt (Senior Notes Narrative) (Details) (USD $)	6 Months Ended				3 Months Ended		3 Months Ended		3 Months Ended		3 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014 Ferrellgas, L.P. [Member]	Jan. 31, 2013 Ferrellgas, L.P. [Member]	Jan. 31, 2014 Senior Notes [Member] Fixed Rate, 6.75%, Due 2022 [Member]	Nov. 04, 2013 Senior Notes [Member] Fixed Rate, 6.75%, Due 2022 [Member]	Jan. 31, 2014 Senior Notes [Member] Fixed Rate, 6.75%, Due 2022 [Member] Ferrellgas, L.P. [Member]	Nov. 04, 2013 Senior Notes [Member] Fixed Rate, 6.75%, Due 2022 [Member] Ferrellgas, L.P. [Member]	Jan. 31, 2014 Senior Notes [Member] Fixed Rate, 9.125%, Due 2017 [Member]	Dec. 04, 2013 Senior Notes [Member] Fixed Rate, 9.125%, Due 2017 [Member]	Jan. 31, 2014 Senior Notes [Member] Fixed Rate, 9.125%, Due 2017 [Member] Ferrellgas, L.P. [Member]	Dec. 04, 2013 Senior Notes [Member] Fixed Rate, 9.125%, Due 2017 [Member] Ferrellgas, L.P. [Member]
Debt issuance principal amount						$ 325,000,000.0		$ 325,000,000.0
Debt interest rate						6.75%		6.75%		9.125%		9.125%
Debt maturity year						2022		2022
Net proceeds from issuance of senior notes					319,300,000.0		319,300,000.0
Debt redemption principal amount										300,000,000.0		300,000,000.0
Maturity date									Oct. 01, 2017		Oct. 01, 2017
Make whole and consent payments									14,700,000		14,700,000
Interest payments	45,648,000	42,646,000	37,800,000	34,797,000					3,300,000		3,300,000
Write off of capitalized financing costs									$ 6,000,000		$ 6,000,000