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Partners' Deficit - Contributions and AOCI (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Jul. 31, 2018
Capital Unit [Line Items]      
Contributions in connection with non-cash ESOP and stock and unit-based compensation charges $ 2,871 $ 5,693 $ 13,859
Ferrellgas Partners LP [Member]      
Capital Unit [Line Items]      
General partner ownership interest 2.00% 2.00%  
Common Unitholders [Member]      
Capital Unit [Line Items]      
Contributions in connection with non-cash ESOP and stock and unit-based compensation charges $ 2,814 $ 5,579 13,582
General Partner [Member]      
Capital Unit [Line Items]      
Contributions in connection with non-cash ESOP and stock and unit-based compensation charges 28 56 137
Ferrellgas, L.P. [Member]      
Capital Unit [Line Items]      
Contributions in connection with non-cash ESOP and stock and unit-based compensation charges 2,871 5,693 13,859
Ferrellgas, L.P. [Member] | Common Unitholders [Member]      
Capital Unit [Line Items]      
Contributions in connection with non-cash ESOP and stock and unit-based compensation charges 2,842 5,635 13,719
Ferrellgas, L.P. [Member] | General Partner [Member]      
Capital Unit [Line Items]      
Contributions in connection with non-cash ESOP and stock and unit-based compensation charges 29 58 $ 140
Ferrellgas Inc., General Partner [Member]      
Capital Unit [Line Items]      
Contributions in connection with non-cash ESOP and stock and unit-based compensation charges $ 57,000 $ 100  
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%