Supplemental Financial Statement Information (Shipping And Handling Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Condensed Financial Statements, Captions [Line Items]
Shipping and handling expenses	$ 205,372	$ 198,229	$ 201,899
Ferrellgas, L.P. [Member]
Condensed Financial Statements, Captions [Line Items]
Shipping and handling expenses	205,372	198,229	201,899
Operating Expense [Member]
Condensed Financial Statements, Captions [Line Items]
Shipping and handling expenses	175,164	167,980	174,105
Operating Expense [Member] | Ferrellgas, L.P. [Member]
Condensed Financial Statements, Captions [Line Items]
Shipping and handling expenses	175,164	167,980	174,105
Depreciation And Amortization Expense [Member]
Condensed Financial Statements, Captions [Line Items]
Shipping and handling expenses	3,909	4,282	5,127
Depreciation And Amortization Expense [Member] | Ferrellgas, L.P. [Member]
Condensed Financial Statements, Captions [Line Items]
Shipping and handling expenses	3,909	4,282	5,127
Equipment Lease Expense [Member]
Condensed Financial Statements, Captions [Line Items]
Shipping and handling expenses	26,299	25,967	22,667
Equipment Lease Expense [Member] | Ferrellgas, L.P. [Member]
Condensed Financial Statements, Captions [Line Items]
Shipping and handling expenses	$ 26,299	$ 25,967	$ 22,667