Segment Reporting - Capital Expenditures (Details) - USD ($) $ in Thousands	9 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Segment Reporting Information [Line Items]
Maintenance	$ 44,647	$ 19,258
Growth	44,654	36,049
Capital expenditures, total	89,301	55,307
Propane and related equipment sales
Segment Reporting Information [Line Items]
Maintenance	43,975	17,556
Growth	44,654	34,784
Capital expenditures, total	88,629	52,340
Corporate and other
Segment Reporting Information [Line Items]
Maintenance	672	1,702
Growth		1,265
Capital expenditures, total	672	2,967
Ferrellgas, L.P. [Member]
Segment Reporting Information [Line Items]
Maintenance	44,647	19,258
Growth	44,654	36,049
Capital expenditures, total	89,301	55,307
Ferrellgas, L.P. [Member] | Propane and related equipment sales
Segment Reporting Information [Line Items]
Maintenance	43,975	17,556
Growth	44,654	34,784
Capital expenditures, total	88,629	52,340
Ferrellgas, L.P. [Member] | Corporate and other
Segment Reporting Information [Line Items]
Maintenance	672	1,702
Growth		1,265
Capital expenditures, total	$ 672	$ 2,967