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Contingencies And Commitments (Details)
1 Months Ended 6 Months Ended
Aug. 31, 2019
USD ($)
item
Jan. 31, 2020
USD ($)
item
Loss Contingencies [Line Items]    
Required fixed charge coverage ratio   175.00%
Class Action Related To Cylinder Fill Level [Member]    
Loss Contingencies [Line Items]    
Settlement paid | $ $ 6,250,000  
Number of claims dismissed 11  
Number of cases 24 13
Lawsuit Related To Sale Of Jamex Transfer Services [Member]    
Loss Contingencies [Line Items]    
Number of former officers   2
Ferrellgas Partners Finance Corp. [Member] | Fixed Rate 8.625% Due 2020    
Loss Contingencies [Line Items]    
Potential liability as co-issuer and co-obligor | $   $ 357,000,000
Ferrellgas Partners Finance Corp. [Member] | Fixed Rate 6.5% Due 2021    
Loss Contingencies [Line Items]    
Potential liability as co-issuer and co-obligor | $   500,000,000
Ferrellgas Partners Finance Corp. [Member] | Fixed Rate 6.75% Due 2023    
Loss Contingencies [Line Items]    
Potential liability as co-issuer and co-obligor | $   500,000,000
Ferrellgas Partners Finance Corp. [Member] | Fixed Rate 6.75% Due 2022    
Loss Contingencies [Line Items]    
Potential liability as co-issuer and co-obligor | $   $ 475,000,000
Ferrellgas, L.P. [Member]    
Loss Contingencies [Line Items]    
Number of quarters for required fixed charge coverage ratio   4
Required fixed charge coverage ratio   175.00%
Current fixed charge coverage ratio   168.00%
Ferrellgas, L.P. [Member] | Class Action Related To Cylinder Fill Level [Member]    
Loss Contingencies [Line Items]    
Settlement paid | $ $ 6,250,000  
Number of claims dismissed 11  
Number of cases 24 13
Ferrellgas, L.P. [Member] | Lawsuit Related To Sale Of Jamex Transfer Services [Member]    
Loss Contingencies [Line Items]    
Number of former officers   2