Leases - Cash Flow (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Operating cash flows, operating leases	$ 8,395	$ 11,049
Operating cash flows, financing leases	877	42
Financing cash flows, financing leases	1,703	38
Ferrellgas, L.P. [Member]
Operating cash flows, operating leases	8,395	11,049
Operating cash flows, financing leases	877	42
Financing cash flows, financing leases	$ 1,703	$ 38