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Derivative Instruments and Hedging Activities (Changes in Derivative Value Effect on Other Comprehensive Income Loss) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2014
Apr. 30, 2013
Jul. 31, 2013
Apr. 30, 2014
Ferrellgas, L.P. [Member]
Apr. 30, 2013
Ferrellgas, L.P. [Member]
Apr. 30, 2014
Ferrellgas, L.P. [Member]
Apr. 30, 2013
Ferrellgas, L.P. [Member]
Jul. 31, 2013
Ferrellgas, L.P. [Member]
Apr. 30, 2014
Propane commodity derivatives [Member]
Apr. 30, 2013
Propane commodity derivatives [Member]
Apr. 30, 2014
Propane commodity derivatives [Member]
Apr. 30, 2013
Propane commodity derivatives [Member]
Apr. 30, 2014
Propane commodity derivatives [Member]
Ferrellgas, L.P. [Member]
Apr. 30, 2013
Propane commodity derivatives [Member]
Ferrellgas, L.P. [Member]
Apr. 30, 2014
Propane commodity derivatives [Member]
Ferrellgas, L.P. [Member]
Apr. 30, 2013
Propane commodity derivatives [Member]
Ferrellgas, L.P. [Member]
Apr. 30, 2014
Interest Rate Swap [Member]
Apr. 30, 2013
Interest Rate Swap [Member]
Apr. 30, 2014
Interest Rate Swap [Member]
Apr. 30, 2013
Interest Rate Swap [Member]
Apr. 30, 2014
Interest Rate Swap [Member]
Ferrellgas, L.P. [Member]
Apr. 30, 2013
Interest Rate Swap [Member]
Ferrellgas, L.P. [Member]
Apr. 30, 2014
Interest Rate Swap [Member]
Ferrellgas, L.P. [Member]
Apr. 30, 2013
Interest Rate Swap [Member]
Ferrellgas, L.P. [Member]
Apr. 30, 2014
Derivative [Member]
Jul. 31, 2013
Derivative [Member]
Apr. 30, 2013
Derivative [Member]
Jul. 31, 2012
Derivative [Member]
Apr. 30, 2014
Derivative [Member]
Ferrellgas, L.P. [Member]
Jul. 31, 2013
Derivative [Member]
Ferrellgas, L.P. [Member]
Apr. 30, 2013
Derivative [Member]
Ferrellgas, L.P. [Member]
Jul. 31, 2012
Derivative [Member]
Ferrellgas, L.P. [Member]
Beginning balance $ 9,848   $ 9,848   $ 1,697 $ 9,962   $ 9,962   $ 1,728                                 $ 10,473 $ 2,066 $ (1,348) $ (12,799) $ 10,473 $ 2,066 $ (1,348) $ (12,799)
Change in value of risk management derivatives 660 1,032 17,047 1,103   660 1,032 17,047 1,103   (165) 1,130 17,298 2,044 (165) 1,130 17,298 2,044 825 (98) (251) (941) 825 (98) (251) (941)                
Reclassification of gains and losses on commodity hedges to cost of product sold - propane and other gas liquids sales 3,885 1,723 8,640 10,348   3,885 1,723 8,640 10,348       (8,640) 10,348     (8,640) 10,348                                
Ending balance $ 9,848   $ 9,848   $ 1,697 $ 9,962   $ 9,962   $ 1,728                                 $ 10,473 $ 2,066 $ (1,348) $ (12,799) $ 10,473 $ 2,066 $ (1,348) $ (12,799)