Derivative Instruments and Hedging Activities (Changes in Derivative Value Effect on Other Comprehensive Income Loss) (Details) (USD $) In Thousands, unless otherwise specified					12 Months Ended															12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014 Ferrellgas, L.P. [Member]	Jul. 31, 2013 Ferrellgas, L.P. [Member]	Jul. 31, 2014 Commodity Derivatives Propane [Member]	Jul. 31, 2013 Commodity Derivatives Propane [Member]	Jul. 31, 2012 Commodity Derivatives Propane [Member]	Jul. 31, 2014 Commodity Derivatives Propane [Member] Ferrellgas, L.P. [Member]	Jul. 31, 2013 Commodity Derivatives Propane [Member] Ferrellgas, L.P. [Member]	Jul. 31, 2012 Commodity Derivatives Propane [Member] Ferrellgas, L.P. [Member]	Jul. 31, 2014 Interest Rate Swap [Member]	Jul. 31, 2013 Interest Rate Swap [Member]	Jul. 31, 2012 Interest Rate Swap [Member]	Jul. 31, 2014 Interest Rate Swap [Member] Ferrellgas, L.P. [Member]	Jul. 31, 2013 Interest Rate Swap [Member] Ferrellgas, L.P. [Member]	Jul. 31, 2012 Interest Rate Swap [Member] Ferrellgas, L.P. [Member]	Jul. 31, 2014 Derivative [Member]	Jul. 31, 2013 Derivative [Member]	Jul. 31, 2011 Derivative [Member]	Jul. 31, 2014 Derivative [Member] Ferrellgas, L.P. [Member]	Jul. 31, 2013 Derivative [Member] Ferrellgas, L.P. [Member]	Jul. 31, 2011 Derivative [Member] Ferrellgas, L.P. [Member]
Beginning balance	$ 6,181	$ 1,697	$ 6,258	$ 1,728													$ 2,066	$ (12,799)	$ 5,161	$ 2,066	$ (12,799)	$ 5,161
Change in value on risk management derivatives					15,473	2,032	(23,290)	15,473	2,032	(23,290)	(881)	2,220	(1,778)	(881)	2,220	(1,778)	14,592	4,252		14,592	4,252
Reclassification of gains and losses of commodity hedges to cost of product sold - propane and other gas liquids sales					(10,175)	10,613	7,108	(10,175)	10,613	7,108							(10,175)	10,613		(10,175)	10,613
Ending balance	$ 6,181	$ 1,697	$ 6,258	$ 1,728													$ 6,483	$ 2,066	$ 5,161	$ 6,483	$ 2,066	$ 5,161