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, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014
Gain (loss) recognized on derivative	$ 601	$ 627	$ 1,408	$ 1,948
Interest expense recognized on fixed-rate debt	(2,275)	(2,275)	(6,825)	(9,915)
Ferrellgas, L.P. [Member]
Gain (loss) recognized on derivative	601	627	1,408	1,948
Interest expense recognized on fixed-rate debt	$ (2,275)	$ (2,275)	$ (6,825)	$ (9,915)