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Equity (Deficit) - Contributions and AOCI (Details) - USD ($)
12 Months Ended
Jul. 31, 2025
Jul. 31, 2024
Jul. 31, 2023
Capital Unit [Line Items]      
Contributions in connection with non-cash ESOP compensation charges $ 3,143,000 $ 3,234,000 $ 2,935,000
Ferrellgas Partners LP      
Capital Unit [Line Items]      
General partner ownership interest 2.00%    
General Partner      
Capital Unit [Line Items]      
Contributions in connection with non-cash ESOP compensation charges $ 31,000 32,000 29,000
Ferrellgas, L.P.      
Capital Unit [Line Items]      
Contributions in connection with non-cash ESOP compensation charges 3,143,000 3,234,000 2,935,000
Ferrellgas, L.P. | General Partner      
Capital Unit [Line Items]      
Contributions in connection with non-cash ESOP compensation charges 32,000 33,000 $ 30,000
Ferrellgas Inc., General Partner      
Capital Unit [Line Items]      
Contributions in connection with non-cash ESOP compensation charges $ 63,000 $ 65,000  
Ferrellgas Inc., General Partner | Ferrellgas, L.P.      
Capital Unit [Line Items]      
General partner ownership interest 1.0101%    
Ferrellgas Inc., General Partner | Ferrellgas Partners LP      
Capital Unit [Line Items]      
General partner ownership interest 1.00%