Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities (Schedule of Derivative Collateral) (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2014	Jul. 31, 2014
Derivative Asset, Fair Value of Collateral	$ 11,038	$ 345
Ferrellgas, L.P. [Member]
Derivative Asset, Fair Value of Collateral	11,038	345
Other assets, net [Member]
Derivative Asset, Fair Value of Collateral	3,207	189
Other assets, net [Member] | Ferrellgas, L.P. [Member]
Derivative Asset, Fair Value of Collateral	3,207	189
Prepaid Expenses and Other Current Assets [Member]
Derivative Asset, Fair Value of Collateral	7,831	156
Prepaid Expenses and Other Current Assets [Member] | Ferrellgas, L.P. [Member]
Derivative Asset, Fair Value of Collateral	$ 7,831	$ 156