Supplemental Financial Statement Information (Shipping And Handling Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Condensed Financial Statements, Captions [Line Items]
Shipping and handling expenses	$ 51,830	$ 49,919	$ 156,951	$ 149,599
Ferrellgas, L.P. [Member]
Condensed Financial Statements, Captions [Line Items]
Shipping and handling expenses	51,830	49,919	156,951	149,599
Operating Expense [Member]
Condensed Financial Statements, Captions [Line Items]
Shipping and handling expenses	44,309	42,378	134,090	126,946
Operating Expense [Member] | Ferrellgas, L.P. [Member]
Condensed Financial Statements, Captions [Line Items]
Shipping and handling expenses	44,309	42,378	134,090	126,946
Depreciation And Amortization Expense [Member]
Condensed Financial Statements, Captions [Line Items]
Shipping and handling expenses	957	1,071	2,979	3,268
Depreciation And Amortization Expense [Member] | Ferrellgas, L.P. [Member]
Condensed Financial Statements, Captions [Line Items]
Shipping and handling expenses	957	1,071	2,979	3,268
Equipment Lease Expense [Member]
Condensed Financial Statements, Captions [Line Items]
Shipping and handling expenses	6,564	6,470	19,882	19,385
Equipment Lease Expense [Member] | Ferrellgas, L.P. [Member]
Condensed Financial Statements, Captions [Line Items]
Shipping and handling expenses	$ 6,564	$ 6,470	$ 19,882	$ 19,385