Partners' Capital (Distributions Paid) (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2016	Oct. 31, 2015
Limited Partners' Capital Account [Line Items]
Distribution Made to Limited Partner, Cash Distributions Paid	$ 50,294	$ 51,963
Ferrellgas, L.P. [Member]
Limited Partners' Capital Account [Line Items]
Distribution Made to Limited Partner, Cash Distributions Paid	66,658	52,493
Public Common Unitholders [Member]
Limited Partners' Capital Account [Line Items]
Distribution Made to Limited Partner, Cash Distributions Paid	35,678	37,330
Ferrell Companies [Member]
Limited Partners' Capital Account [Line Items]
Distribution Made to Limited Partner, Cash Distributions Paid	11,546	11,546
FCI Trading Corp. [Member]
Limited Partners' Capital Account [Line Items]
Distribution Made to Limited Partner, Cash Distributions Paid	100	100
Ferrell Propane, Inc [Member]
Limited Partners' Capital Account [Line Items]
Distribution Made to Limited Partner, Cash Distributions Paid	26	26
James E. Ferrell [Member]
Limited Partners' Capital Account [Line Items]
Distribution Made to Limited Partner, Cash Distributions Paid	2,441	2,441
Ferrellgas Partners [Member] | Ferrellgas, L.P. [Member]
Limited Partners' Capital Account [Line Items]
Distribution Made to Limited Partner, Cash Distributions Paid	66,145	51,963
General Partner [Member]
Limited Partners' Capital Account [Line Items]
Distribution Made to Limited Partner, Cash Distributions Paid	503	520
General Partner [Member] | Ferrellgas, L.P. [Member]
Limited Partners' Capital Account [Line Items]
Distribution Made to Limited Partner, Cash Distributions Paid	$ 513	$ 530