Supplemental Financial Statement Information (Shipping And Handling Expenses) (Details) (USD $) In Thousands	12 Months Ended
	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2009
Shipping and handling expenses	$ 202,785	$ 203,405	$ 200,674
Ferrellgas, L.P. And Subsidiaries [Member] | Operating Expense [Member]
Shipping and handling expenses	183,899	183,612	178,218
Operating Expense [Member]
Shipping and handling expenses	183,899	183,612	178,218
Ferrellgas, L.P. And Subsidiaries [Member] | Depreciation And Amortization Expense [Member]
Shipping and handling expenses	6,063	5,601	4,915
Depreciation And Amortization Expense [Member]
Shipping and handling expenses	6,063	5,601	4,915
Ferrellgas, L.P. And Subsidiaries [Member] | Equipment Lease Expense [Member]
Shipping and handling expenses	12,823	14,192	17,541
Equipment Lease Expense [Member]
Shipping and handling expenses	12,823	14,192	17,541
Ferrellgas, L.P. And Subsidiaries [Member]
Shipping and handling expenses	$ 202,785	$ 203,405	$ 200,674