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, 2014	Jul. 31, 2013
Derivative, Gain (Loss) on Derivative, Net	$ 2,520	$ 3,205
Interest Expense, Debt	(11,985)	(21,875)
Ferrellgas, L.P. [Member]
Derivative, Gain (Loss) on Derivative, Net	2,520	3,205
Interest Expense, Debt	$ (11,985)	$ (21,875)