Employee Benefits (Details) $ in Thousands	12 Months Ended
	Jul. 31, 2020 USD ($) employee	Jul. 31, 2019 USD ($)	Jul. 31, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of employees | employee	0
Non-cash employee stock ownership plan compensation charge	$ 2,871	$ 5,693	$ 13,859
Contributions to defined contribution plan	4,800	4,600	3,700
Defined benefit plan adjustments to other comprehensive income and other liabilities	$ (100)	(100)	100
Ferrellgas, L.P. [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of employees | employee	0
Non-cash employee stock ownership plan compensation charge	$ 2,871	5,693	13,859
Contributions to defined contribution plan	4,800	4,600	3,700
Defined benefit plan adjustments to other comprehensive income and other liabilities	$ (100)	$ (100)	$ 100