Derivative Instruments and Hedging Activities (Fair Value Interest Rate Derivative Income Location) (Details) (Interest Rate Swap [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Derivative, Gain (Loss) on Derivative, Net	$ 883	$ 0	$ 1,607	$ 0
Interest Expense, Debt	(5,469)	(5,469)	(10,938)	(10,938)
Ferrellgas, L.P. [Member]
Derivative, Gain (Loss) on Derivative, Net	883	0	1,607	0
Interest Expense, Debt	$ (5,469)	$ (5,469)	$ (10,938)	$ (10,938)