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Partners' Capital (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Nov. 16, 2017
Mar. 17, 2017
Feb. 23, 2017
Oct. 31, 2017
Oct. 31, 2016
Jul. 31, 2016
Jul. 31, 2017
Capital Unit [Line Items]              
Limited Partners' Capital Account, Units Outstanding       97,152,665     97,152,665
Cash distributions declared per common unit       $ 0.10 $ 0.40 $ 2.05  
General partner ownership interest       1.00%      
Ferrellgas, L.P. [Member]              
Capital Unit [Line Items]              
Cash distributions declared per common unit       $ 0.40 $ 2.05    
General partner ownership interest       1.00%      
JEF Capital Management [Member]              
Capital Unit [Line Items]              
Limited Partners' Capital Account, Units Outstanding       4,758,859      
Ferrell Resources Holdings, Inc. [Member]              
Capital Unit [Line Items]              
Limited Partners' Capital Account, Units Outstanding       4,616      
FCI Trading Corp. [Member]              
Capital Unit [Line Items]              
Limited Partners' Capital Account, Units Outstanding       195,686     195,686
General Partner [Member]              
Capital Unit [Line Items]              
General partner ownership interest       2.00%      
Non-cash contributions       $ 100 $ 100    
General Partner [Member] | Ferrellgas, L.P. [Member]              
Capital Unit [Line Items]              
General partner ownership interest       1.0101%      
Non-cash contributions       $ 100 $ 100    
Ferrell Propane, Inc [Member]              
Capital Unit [Line Items]              
Limited Partners' Capital Account, Units Outstanding       51,204     51,204
Ferrell Companies Beneficial Ownership [Member]              
Capital Unit [Line Items]              
Limited partner ownership interest       23.40%      
Ferrell Companies [Member]              
Capital Unit [Line Items]              
Limited partner ownership interest       23.00%      
Subsequent Event [Member]              
Capital Unit [Line Items]              
Cash distribution declaration date Nov. 16, 2017            
Cash distributions declared per common unit       $ 0.10      
Cash distributions payment date   Dec. 15, 2017          
Subsequent Event [Member] | Ferrellgas, L.P. [Member]              
Capital Unit [Line Items]              
Cash distribution declaration date     Nov. 16, 2017        
Cash distributions payment date   Dec. 15, 2017          
Subsequent Event [Member] | FCI Trading Corp. [Member]              
Capital Unit [Line Items]              
Distribution Made to Limited Partner, Cash Distributions Declared $ 20            
Subsequent Event [Member] | Ferrellgas Partners [Member] | Ferrellgas, L.P. [Member]              
Capital Unit [Line Items]              
Distribution Made to Limited Partner, Cash Distributions Declared     $ 25,200        
Subsequent Event [Member] | General Partner [Member]              
Capital Unit [Line Items]              
Distribution Made to Limited Partner, Cash Distributions Declared 98            
Subsequent Event [Member] | General Partner [Member] | Ferrellgas, L.P. [Member]              
Capital Unit [Line Items]              
Distribution Made to Limited Partner, Cash Distributions Declared     $ 300        
Subsequent Event [Member] | Ferrell Propane, Inc [Member]              
Capital Unit [Line Items]              
Distribution Made to Limited Partner, Cash Distributions Declared 5            
Subsequent Event [Member] | Ferrell Companies [Member]              
Capital Unit [Line Items]              
Distribution Made to Limited Partner, Cash Distributions Declared $ 2,253