Leases - Cash Flow (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Operating cash flows, operating leases	$ 41,636
Operating cash flows, financing leases	1,060
Financing cash flows, financing leases	2,116	$ 0	$ 0
Ferrellgas, L.P. [Member]
Operating cash flows, operating leases	41,636
Operating cash flows, financing leases	1,060
Financing cash flows, financing leases	$ 2,116