Supplemental Financial Statement Information (Shipping And Handling Expenses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Supplemental Financial Statement Information [Line Items]
Shipping and handling expenses	$ 53,153	$ 52,690	$ 101,968	$ 101,153
Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Shipping and handling expenses	53,153	52,690	101,968	101,153
Operating Expense [Member]
Supplemental Financial Statement Information [Line Items]
Shipping and handling expenses	48,260	47,937	92,161	91,725
Operating Expense [Member] | Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Shipping and handling expenses	48,260	47,937	92,161	91,725
Depreciation And Amortization Expense [Member]
Supplemental Financial Statement Information [Line Items]
Shipping and handling expenses	1,400	1,700	2,927	3,284
Depreciation And Amortization Expense [Member] | Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Shipping and handling expenses	1,400	1,700	2,927	3,284
Equipment Lease Expense [Member]
Supplemental Financial Statement Information [Line Items]
Shipping and handling expenses	3,493	3,053	6,880	6,144
Equipment Lease Expense [Member] | Ferrellgas, L.P. [Member]
Supplemental Financial Statement Information [Line Items]
Shipping and handling expenses	$ 3,493	$ 3,053	$ 6,880	$ 6,144