Supplemental Information - Prepaids and Other Assets (Details) - USD ($) $ in Thousands	Jul. 31, 2020	Jul. 31, 2019
Supplemental Financial Statement Information [Line Items]
Broker margin deposit assets	$ 14,398	$ 25,028
Other assets, net	21,546	17,247
Prepaid expenses and other current assets	35,944	42,275
Notes receivable, less current portion and allowance	5,330	16,216
Finance lease right-of-use assets	41,426
Other	27,992	52,889
Other assets, net	74,748	69,105
Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Broker margin deposit assets	14,398	25,028
Other assets, net	21,499	17,129
Prepaid expenses and other current assets	35,897	42,157
Notes receivable, less current portion and allowance	5,330	16,216
Finance lease right-of-use assets	41,426
Other	27,992	52,889
Other assets, net	$ 74,748	$ 69,105