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Partners' Deficit - Contributions and AOCI (Details)
MBbls in Thousands, $ in Thousands, gal in Millions
1 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
shares
MBbls
Jul. 31, 2019
USD ($)
shares
gal
Jul. 31, 2018
USD ($)
shares
Jul. 31, 2017
USD ($)
shares
Capital Unit [Line Items]        
Common unitholders, units outstanding | shares   97,152,665 97,152,665  
Minimum percentage ownership of outstanding common units resulting in non voting of owners   20.00%    
Payments for repurchase of common stock $ 16,900 $ 0 $ 0 $ 15,851
Common unit repurchases (in shares) | shares 900,000      
Net procurement of fixed priced propane by Ferrellgas in gallons 23 2.3    
Non-cash contribution   $ 5,693 $ 13,859 18,386
Ferrellgas Partners LP [Member]        
Capital Unit [Line Items]        
Limited partner ownership interest   98.00%    
General partner ownership interest   2.00% 2.00%  
Ferrellgas, L.P. [Member]        
Capital Unit [Line Items]        
Cash received from contributions     $ 100  
Net procurement of fixed priced propane by Ferrellgas in gallons | gal   2.3    
Non-cash contribution   $ 5,693 13,859 18,386
Ferrellgas, L.P. [Member] | Ferrellgas Partners LP [Member]        
Capital Unit [Line Items]        
General partner ownership interest   1.00%    
Ferrellgas Inc., General Partner [Member]        
Capital Unit [Line Items]        
Non-cash contribution   $ 100 $ 300  
Ferrellgas Inc., General Partner [Member] | Ferrellgas, L.P. [Member]        
Capital Unit [Line Items]        
General partner ownership interest   1.0101% 1.0101%  
Ferrellgas Inc., General Partner [Member] | Ferrellgas Partners LP [Member]        
Capital Unit [Line Items]        
General partner ownership interest   1.00%    
Ferrell Companies [Member] | Ferrellgas, L.P. [Member]        
Capital Unit [Line Items]        
General partner ownership interest   1.00%    
Ferrell Companies [Member] | Ferrellgas Partners LP [Member]        
Capital Unit [Line Items]        
Limited partner ownership interest   23.20%    
Ferrell Companies [Member]        
Capital Unit [Line Items]        
Common unitholders, units outstanding | shares   22,529,361 22,529,361  
Ferrell Companies [Member] | Ferrellgas Partners LP [Member]        
Capital Unit [Line Items]        
Limited partner ownership interest   23.40%    
Ferrell Companies [Member] | FCI Trading Corp. [Member]        
Capital Unit [Line Items]        
Common unitholders, units outstanding | shares   195,686    
Ferrell Companies [Member] | Ferrell Propane, Inc. [Member]        
Capital Unit [Line Items]        
Common unitholders, units outstanding | shares   51,204    
Ferrellgas Partners LP [Member] | Ferrellgas, L.P. [Member]        
Capital Unit [Line Items]        
Cash received from contributions       166,100
Ferrellgas Inc., General Partner [Member] | Ferrellgas, L.P. [Member]        
Capital Unit [Line Items]        
Cash received from contributions       $ 1,700
James E. Ferrell [Member]        
Capital Unit [Line Items]        
Common unitholders, units outstanding | shares   4,763,475 4,763,475  
James E. Ferrell [Member] | JEF Capital Management [Member]        
Capital Unit [Line Items]        
Common unitholders, units outstanding | shares   4,758,859    
James E. Ferrell [Member] | Ferrell Resources Holdings, Inc. [Member] | Ferrellgas Partners LP [Member]        
Capital Unit [Line Items]        
Common unitholders, units outstanding | shares   4,616    
Common Unitholders [Member]        
Capital Unit [Line Items]        
Common unit repurchases (in shares) | shares       850,000
Non-cash contribution   $ 5,579 $ 13,582 $ 18,018
Common Unitholders [Member] | Ferrellgas, L.P. [Member]        
Capital Unit [Line Items]        
Non-cash contribution   5,635 13,719 18,201
General Partner [Member]        
Capital Unit [Line Items]        
Non-cash contribution   56 137 183
General Partner [Member] | Ferrellgas, L.P. [Member]        
Capital Unit [Line Items]        
Non-cash contribution   $ 58 $ 140 $ 185