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Partners' Capital (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 16, 2018
Feb. 22, 2018
Feb. 21, 2018
Mar. 17, 2017
Feb. 23, 2017
Jan. 31, 2018
Jan. 31, 2018
Jan. 31, 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             $ 200 200  
General Partner [Member] | Ferrellgas, L.P. [Member]                  
Capital Unit [Line Items]                  
General partner ownership interest             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     Feb. 22, 2018            
Cash distributions declared per common unit           $ 0.10      
Distribution Made to Limited Partner, Distribution Date Mar. 16, 2018                
Subsequent Event [Member] | Ferrellgas, L.P. [Member]                  
Capital Unit [Line Items]                  
Cash distribution declaration date         Feb. 22, 2018        
Distribution Made to Limited Partner, Distribution Date       Mar. 16, 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         $ 9,800        
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         $ 100        
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