Segment Reporting Segment Reporting (Schedule of Segment Reporting Information, by Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Statement [Line Items]
Revenues	$ 1,930,277	$ 2,039,367	$ 2,024,390
Costs and Expenses	1,700,214	1,694,637	1,724,206
Adjusted EBITDA	230,063	344,730	300,184
Propane and related equipment sales [Member]
Statement [Line Items]
Revenues	1,463,574	1,414,129	1,917,201
Costs and Expenses	1,198,150	1,127,382	1,591,404
Adjusted EBITDA	265,424	286,747	325,797
Midstream - Crude Oil Logistics [Member]
Statement [Line Items]
Revenues	466,703	625,238	107,189
Costs and Expenses	458,851	521,487	93,070
Adjusted EBITDA	7,852	103,751	14,119
Corporate and Other [Member]
Statement [Line Items]
Revenues	0	0	0
Costs and Expenses	43,213	45,768	39,732
Adjusted EBITDA	(43,213)	(45,768)	(39,732)
Ferrellgas, L.P. [Member]
Statement [Line Items]
Revenues	1,930,277	2,039,367	2,024,390
Costs and Expenses	1,700,075	1,694,117	1,724,102
Adjusted EBITDA	230,202	345,250	300,288
Ferrellgas, L.P. [Member] | Propane and related equipment sales [Member]
Statement [Line Items]
Revenues	1,463,574	1,414,129	1,917,201
Costs and Expenses	1,198,150	1,127,382	1,591,300
Adjusted EBITDA	265,424	286,747	325,901
Ferrellgas, L.P. [Member] | Midstream - Crude Oil Logistics [Member]
Statement [Line Items]
Revenues	466,703	625,238	107,189
Costs and Expenses	458,851	521,487	93,070
Adjusted EBITDA	7,852	103,751	14,119
Ferrellgas, L.P. [Member] | Corporate and Other [Member]
Statement [Line Items]
Revenues	0	0	0
Costs and Expenses	43,074	45,248	39,732
Adjusted EBITDA	$ (43,074)	$ (45,248)	$ (39,732)