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Partners' Capital (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jun. 14, 2018
May 24, 2018
Apr. 30, 2018
Apr. 30, 2018
Apr. 30, 2017
Jul. 31, 2017
Capital Unit [Line Items]            
Limited Partners' Capital Account, Units Outstanding     97,152,665 97,152,665   97,152,665
Cash distributions declared per common unit     $ 0.10      
General partner ownership interest       1.00%    
Ferrellgas, L.P. [Member]            
Capital Unit [Line Items]            
General partner ownership interest       1.00%    
Contributions from partners       $ 0 $ 167,640  
JEF Capital Management [Member]            
Capital Unit [Line Items]            
Limited Partners' Capital Account, Units Outstanding     4,758,859 4,758,859    
Ferrell Resources Holdings, Inc. [Member]            
Capital Unit [Line Items]            
Limited Partners' Capital Account, Units Outstanding     4,616 4,616    
FCI Trading Corp. [Member]            
Capital Unit [Line Items]            
Limited Partners' Capital Account, Units Outstanding     195,686 195,686   195,686
General Partner [Member]            
Capital Unit [Line Items]            
General partner ownership interest       2.00% 2.00%  
Contributions from partners         $ 1,700  
Non-cash contributions       $ 200 $ 300  
General Partner [Member] | Ferrellgas, L.P. [Member]            
Capital Unit [Line Items]            
General partner ownership interest       1.0101% 1.0101%  
Contributions from partners         $ 1,700  
Non-cash contributions       $ 100 $ 100  
Ferrell Propane, Inc [Member]            
Capital Unit [Line Items]            
Limited Partners' Capital Account, Units Outstanding     51,204 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   May 24, 2018        
Cash distributions declared per common unit   $ 0.10        
Distribution Made to Limited Partner, Distribution Date Jun. 14, 2018          
Subsequent Event [Member] | Ferrellgas, L.P. [Member]            
Capital Unit [Line Items]            
Cash distribution declaration date   May 24, 2018        
Distribution Made to Limited Partner, Distribution Date Jun. 14, 2018          
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   25,300        
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