Employee Benefits (Details) $ in Thousands	12 Months Ended
	Jul. 31, 2017 USD ($) employee	Jul. 31, 2016 USD ($)	Jul. 31, 2015 USD ($)
Number of employees | employee	0
Non-cash employee stock ownership plan compensation charge	$ 15,088	$ 27,595	$ 24,713
Matching contributions	4,200	4,000	3,900
Accumulated Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Tax	$ 500	(300)	(200)
Ferrellgas, L.P. [Member]
Number of employees | employee	0
Non-cash employee stock ownership plan compensation charge	$ 15,088	27,595	24,713
Matching contributions	4,200	4,000	3,900
Accumulated Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Tax	$ 500	$ (300)	$ (200)