Supplemental Financial Statement Information (Shipping And Handling Expenses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014
Condensed Financial Statements, Captions [Line Items]
Shipping and handling expenses	$ 48,385	$ 53,608	$ 155,655	$ 164,590
Ferrellgas, L.P. [Member]
Condensed Financial Statements, Captions [Line Items]
Shipping and handling expenses	48,385	53,608	155,655	164,590
Operating Expense [Member]
Condensed Financial Statements, Captions [Line Items]
Shipping and handling expenses	41,291	47,967	135,206	148,700
Operating Expense [Member] | Ferrellgas, L.P. [Member]
Condensed Financial Statements, Captions [Line Items]
Shipping and handling expenses	41,291	47,967	135,206	148,700
Depreciation And Amortization Expense [Member]
Condensed Financial Statements, Captions [Line Items]
Shipping and handling expenses	1,194	1,492	3,970	4,347
Depreciation And Amortization Expense [Member] | Ferrellgas, L.P. [Member]
Condensed Financial Statements, Captions [Line Items]
Shipping and handling expenses	1,194	1,492	3,970	4,347
Equipment Lease Expense [Member]
Condensed Financial Statements, Captions [Line Items]
Shipping and handling expenses	5,900	4,149	16,479	11,543
Equipment Lease Expense [Member] | Ferrellgas, L.P. [Member]
Condensed Financial Statements, Captions [Line Items]
Shipping and handling expenses	$ 5,900	$ 4,149	$ 16,479	$ 11,543