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Contingencies and commitments (Details) - USD ($)
$ in Millions
Jun. 07, 2024
Apr. 30, 2024
Jul. 31, 2023
Minimum | Subsequent Event      
Contingencies and commitments      
Range of possible loss $ 0.0    
Ferrellgas Partners Finance Corp      
Contingencies and commitments      
Debt securities outstanding   $ 0.0  
Ferrellgas Finance Corp | Senior Notes 5.375 Percent Due 2026      
Contingencies and commitments      
Liability as co-issuer   650.0 $ 650.0
Ferrellgas Finance Corp | Senior Notes 5.875 Percent Due 2029      
Contingencies and commitments      
Liability as co-issuer   $ 825.0 $ 825.0