Supplemental Information - Prepaids and Other Assets (Details) - USD ($) $ in Thousands	Apr. 30, 2020	Jul. 31, 2019
Supplemental Financial Statement Information [Line Items]
Broker margin deposit assets	$ 27,233	$ 25,028
Other assets, net	19,990	17,247
Prepaid expenses and other current assets	47,223	42,275
Notes receivable, less current portion	8,760	16,216
Other	78,712	52,889
Other assets, net	87,472	69,105
Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Broker margin deposit assets	27,233	25,028
Other assets, net	19,942	17,129
Prepaid expenses and other current assets	47,175	42,157
Notes receivable, less current portion	8,760	16,216
Other	78,712	52,889
Other assets, net	$ 87,472	$ 69,105