Supplemental Financial Statement Information - Shipping and Handling (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Supplemental Financial Statement Information [Line Items]
Operating expense	$ 121,219	$ 123,716	$ 231,550	$ 234,178
Depreciation and amortization expense	19,605	25,485	38,597	51,217
Equipment lease expense	8,415	6,954	16,278	13,695
Costs and Expenses, Total	453,721	634,529	788,189	1,062,968
Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Operating expense	121,219	123,716	231,550	234,178
Depreciation and amortization expense	19,605	25,485	38,597	51,217
Equipment lease expense	8,415	6,954	16,278	13,695
Costs and Expenses, Total	453,720	634,528	788,184	1,062,967
Shipping and Handling [Member]
Supplemental Financial Statement Information [Line Items]
Operating expense	60,279	54,613	107,721	97,928
Depreciation and amortization expense	1,389	1,123	2,462	2,235
Equipment lease expense	7,869	6,296	15,388	12,364
Costs and Expenses, Total	69,537	62,032	125,571	112,527
Shipping and Handling [Member] | Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Operating expense	60,279	54,613	107,721	97,928
Depreciation and amortization expense	1,389	1,123	2,462	2,235
Equipment lease expense	7,869	6,296	15,388	12,364
Costs and Expenses, Total	$ 69,537	$ 62,032	$ 125,571	$ 112,527