Supplemental Financial Statement Information (Shipping And Handling Expenses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 31, 2014	Oct. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Shipping and handling expenses	$ 52,105	$ 51,020
Ferrellgas, L.P. [Member]
Condensed Financial Statements, Captions [Line Items]
Shipping and handling expenses	52,105	51,020
Operating Expense [Member]
Condensed Financial Statements, Captions [Line Items]
Shipping and handling expenses	45,790	45,978
Operating Expense [Member] | Ferrellgas, L.P. [Member]
Condensed Financial Statements, Captions [Line Items]
Shipping and handling expenses	45,790	45,978
Depreciation And Amortization Expense [Member]
Condensed Financial Statements, Captions [Line Items]
Shipping and handling expenses	1,449	1,415
Depreciation And Amortization Expense [Member] | Ferrellgas, L.P. [Member]
Condensed Financial Statements, Captions [Line Items]
Shipping and handling expenses	1,449	1,415
Equipment Lease Expense [Member]
Condensed Financial Statements, Captions [Line Items]
Shipping and handling expenses	4,866	3,627
Equipment Lease Expense [Member] | Ferrellgas, L.P. [Member]
Condensed Financial Statements, Captions [Line Items]
Shipping and handling expenses	$ 4,866	$ 3,627