Derivative Instruments and Hedging Activities (Fair Value Hedge Derivative Effect on Earnings) (Details) (Interest Rate Swap [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012
Derivative, Gain (Loss) on Derivative, Net	$ 3,205	$ 757
Interest Expense, Debt	(21,875)	(21,875)
Ferrellgas, L.P. [Member]
Derivative, Gain (Loss) on Derivative, Net	3,205	757
Interest Expense, Debt	$ (21,875)	$ (21,875)