Supplemental Financial Statement Information - Prepaids and Other Assets (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jul. 31, 2019
Supplemental Financial Statement Information [Line Items]
Broker margin deposit assets	$ 33,436	$ 25,028
Other assets, net	14,315	17,247
Prepaid expenses and other current assets	47,751	42,275
Notes receivable, less current portion	11,281	16,216
Other	69,717	52,889
Other assets, net	80,998	69,105
Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Broker margin deposit assets	33,436	25,028
Other assets, net	14,267	17,129
Prepaid expenses and other current assets	47,703	42,157
Notes receivable, less current portion	11,281	16,216
Other	69,717	52,889
Other assets, net	$ 80,998	$ 69,105