Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities (Derivatives Not Designated as Hedging Effect on Earnings) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Apr. 30, 2015	Apr. 30, 2015
Operating Expense [Member]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 1,609	$ 1,609
Ferrellgas, L.P. [Member]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 1,609	$ 1,609