Supplemental Financial Statement Information - Assets (Details) - USD ($) $ in Thousands	Jul. 31, 2019	Jul. 31, 2018
Supplemental Financial Statement Information [Line Items]
Broker margin deposit assets	$ 25,028	$ 2,851
Other assets, net	17,247	32,011
Prepaid expenses and other current assets	42,275	34,862
Notes receivable, less current portion	16,216	27,491
Other	52,889	47,097
Other assets, net	69,105	74,588
Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Broker margin deposit assets	25,028	2,851
Other assets, net	17,129	31,979
Prepaid expenses and other current assets	42,157	34,830
Notes receivable, less current portion	16,216	27,491
Other	52,889	47,097
Other assets, net	$ 69,105	$ 74,588