Segment Reporting - Capital Expenditures (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Segment Reporting Information [Line Items]
Maintenance	$ 47,053	$ 27,563	$ 17,138
Growth	56,145	52,484	29,227
Capital expenditures, total	103,198	80,047	46,365
Propane and related equipment sales
Segment Reporting Information [Line Items]
Maintenance	44,439	23,979	13,330
Growth	56,145	51,229	28,912
Capital expenditures, total	100,584	75,208	42,242
Corporate and other
Segment Reporting Information [Line Items]
Maintenance	2,614	3,584	3,808
Growth		1,255	315
Capital expenditures, total	2,614	4,839	4,123
Ferrellgas, L.P. [Member]
Segment Reporting Information [Line Items]
Maintenance	47,053	27,563	17,138
Growth	56,145	52,484	29,227
Capital expenditures, total	103,198	80,047	46,365
Ferrellgas, L.P. [Member] | Propane and related equipment sales
Segment Reporting Information [Line Items]
Maintenance	44,439	23,979	13,330
Growth	56,145	51,229	28,912
Capital expenditures, total	100,584	75,208	42,242
Ferrellgas, L.P. [Member] | Corporate and other
Segment Reporting Information [Line Items]
Maintenance	2,614	3,584	3,808
Growth		1,255	315
Capital expenditures, total	$ 2,614	$ 4,839	$ 4,123