Contingencies And Commitments - Exit costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Restructuring Cost and Reserve [Line Items]
Business Exit Costs	$ 0	$ 11,804	$ 0
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	11,804	0
Exit costs associated with contracts		11,804
Cash payments and other	(802)	0
Accretion	448
Restructuring Reserve, Ending Balance	11,450	11,804	0
Ferrellgas, L.P. [Member]
Restructuring Cost and Reserve [Line Items]
Business Exit Costs	0	11,804	0
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	11,804	0
Exit costs associated with contracts		11,804
Cash payments and other	(802)	0
Accretion	448
Restructuring Reserve, Ending Balance	$ 11,450	$ 11,804	$ 0