Segment Reporting Segment Reporting (Schedule of Segment Reporting Information, by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2018	Jan. 31, 2017
Segment Reporting Information
Revenues	$ 755,156	$ 579,250	$ 1,209,811	$ 958,792
Costs and Expenses	634,529	474,220	1,062,968	824,743
Adjusted EBITDA	120,627	105,030	146,843	134,049
Propane and related equipment sales [Member]
Segment Reporting Information
Revenues	637,880	482,463	971,775	753,961
Costs and Expenses	507,386	370,175	810,715	607,189
Adjusted EBITDA	130,494	112,288	161,060	146,772
Midstream Operations [Member]
Segment Reporting Information
Revenues	117,276	96,787	238,036	204,831
Costs and Expenses	114,929	93,718	228,830	196,491
Adjusted EBITDA	2,347	3,069	9,206	8,340
Corporate Segment [Member]
Segment Reporting Information
Revenues	0	0	0	0
Costs and Expenses	12,214	10,327	23,423	21,063
Adjusted EBITDA	(12,214)	(10,327)	(23,423)	(21,063)
Ferrellgas, L.P. [Member]
Segment Reporting Information
Revenues	755,156	579,250	1,209,811	958,792
Costs and Expenses	634,528	474,219	1,062,967	824,742
Adjusted EBITDA	120,628	105,031	146,844	134,050
Ferrellgas, L.P. [Member] | Propane and related equipment sales [Member]
Segment Reporting Information
Revenues	637,880	482,463	971,775	753,961
Costs and Expenses	507,386	370,175	810,715	607,189
Adjusted EBITDA	130,494	112,288	161,060	146,772
Ferrellgas, L.P. [Member] | Midstream Operations [Member]
Segment Reporting Information
Revenues	117,276	96,787	238,036	204,831
Costs and Expenses	114,929	93,718	228,830	196,490
Adjusted EBITDA	2,347	3,069	9,206	8,341
Ferrellgas, L.P. [Member] | Corporate Segment [Member]
Segment Reporting Information
Revenues	0	0	0	0
Costs and Expenses	12,213	10,326	23,422	21,063
Adjusted EBITDA	$ (12,213)	$ (10,326)	$ (23,422)	$ (21,063)