Derivative Instruments and Hedging Activities (Fair Value Hedge Derivative Effect on Earnings) (Details) (Interest Rate Swap [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013
Gain (loss) recognized on derivative	$ 627	$ 805	$ 1,948	$ 2,412
Interest expense recognized on fixed-rate debt	(2,275)	(5,469)	(9,915)	(16,406)
Ferrellgas, L.P. [Member]
Gain (loss) recognized on derivative	627	805	1,948	2,412
Interest expense recognized on fixed-rate debt	$ (2,275)	$ (5,469)	$ (9,915)	$ (16,406)