Supplemental Information - Prepaids and Other Assets (Details) - USD ($) $ in Thousands	Oct. 31, 2020	Jul. 31, 2020
Supplemental Financial Statement Information [Line Items]
Broker margin deposit assets	$ 9,381	$ 14,398
Other assets, net	30,707	21,546
Prepaid expenses and other current assets	40,088	35,944
Finance lease right-of-use assets	39,753	41,426
Other assets, net	73,522	74,748
Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Broker margin deposit assets	9,381	14,398
Other assets, net	30,663	21,499
Prepaid expenses and other current assets	40,044	35,897
Finance lease right-of-use assets	39,753	41,426
Other assets, net	$ 73,522	$ 74,748