Segment Reporting Segment Reporting (Schedule of Segment Reporting Information, by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Segment Reporting Information
Revenues	$ 538,109	$ 509,472	$ 1,496,901	$ 1,629,856
Costs and Expenses	461,319	401,486	1,286,062	1,334,642
Adjusted EBITDA	76,790	107,986	210,839	295,214
Propane and related equipment sales [Member]
Segment Reporting Information
Revenues	411,433	404,048	1,165,394	1,142,429
Costs and Expenses	324,442	307,708	931,631	888,380
Adjusted EBITDA	86,991	96,340	233,763	254,049
Midstream - Crude Oil Logistics [Member]
Segment Reporting Information
Revenues	126,676	105,424	331,507	487,427
Costs and Expenses	127,223	82,094	323,714	411,973
Adjusted EBITDA	(547)	23,330	7,793	75,454
Corporate and Other [Member]
Segment Reporting Information
Revenues	0	0	0	0
Costs and Expenses	9,654	11,684	30,717	34,289
Adjusted EBITDA	(9,654)	(11,684)	(30,717)	(34,289)
Ferrellgas, L.P. [Member]
Segment Reporting Information
Revenues	538,109	509,472	1,496,901	1,629,856
Costs and Expenses	461,210	401,386	1,285,952	1,334,144
Adjusted EBITDA	76,899	108,086	210,949	295,712
Ferrellgas, L.P. [Member] | Propane and related equipment sales [Member]
Segment Reporting Information
Revenues	411,433	404,048	1,165,394	1,142,429
Costs and Expenses	324,442	307,708	931,631	888,380
Adjusted EBITDA	86,991	96,340	233,763	254,049
Ferrellgas, L.P. [Member] | Midstream - Crude Oil Logistics [Member]
Segment Reporting Information
Revenues	126,676	105,424	331,507	487,427
Costs and Expenses	127,223	82,094	323,714	411,973
Adjusted EBITDA	(547)	23,330	7,793	75,454
Ferrellgas, L.P. [Member] | Corporate and Other [Member]
Segment Reporting Information
Revenues	0	0	0	0
Costs and Expenses	9,545	11,584	30,607	33,791
Adjusted EBITDA	$ (9,545)	$ (11,584)	$ (30,607)	$ (33,791)