Supplemental Financial Statement Information - Prepaids and Other Assets (Details) - USD ($) $ in Thousands	Oct. 31, 2019	Jul. 31, 2019
Supplemental Financial Statement Information [Line Items]
Broker margin deposit assets	$ 33,519	$ 25,028
Other assets, net	17,063	17,247
Prepaid expenses and other current assets	50,582	42,275
Notes receivable, less current portion	13,809	16,216
Other	61,634	52,889
Other assets, net	75,443	69,105
Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Broker margin deposit assets	33,519	25,028
Other assets, net	16,907	17,129
Prepaid expenses and other current assets	50,426	42,157
Notes receivable, less current portion	13,809	16,216
Other	61,634	52,889
Other assets, net	$ 75,443	$ 69,105