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Contingencies And Commitments (Details)
1 Months Ended 9 Months Ended
Aug. 31, 2019
USD ($)
item
Apr. 30, 2020
USD ($)
item
Jan. 31, 2017
USD ($)
Jun. 30, 2015
USD ($)
Jul. 31, 2014
USD ($)
Nov. 30, 2010
USD ($)
Loss Contingencies [Line Items]            
Required fixed charge coverage ratio   175.00%        
Current fixed charge coverage ratio   135.00%        
Fixed rate 8.625% Due 2020            
Loss Contingencies [Line Items]            
Aggregate principal amount   $ 357,000,000 $ 175,000,000      
Fixed rate 6.5% Due 2021            
Loss Contingencies [Line Items]            
Aggregate principal amount   500,000,000       $ 500,000,000
Fixed rate 6.75% Due 2023            
Loss Contingencies [Line Items]            
Aggregate principal amount       $ 500,000,000    
Fixed rate 6.75% Due 2022            
Loss Contingencies [Line Items]            
Aggregate principal amount         $ 475,000,000  
Fixed rate 10.00% Due 2025            
Loss Contingencies [Line Items]            
Aggregate principal amount   $ 700,000,000        
Class Action Related To Cylinder Fill Level [Member]            
Loss Contingencies [Line Items]            
Settlement paid $ 6,250,000          
Number of claims dismissed | item 11          
Number of cases | item 24 13        
Lawsuit Related To Sale Of Jamex Transfer Services [Member]            
Loss Contingencies [Line Items]            
Number of former officers | item   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        
Aggregate principal amount   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        
Aggregate principal amount   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 Partners Finance Corp. [Member] | Fixed rate 10.00% Due 2025            
Loss Contingencies [Line Items]            
Potential liability as co-issuer and co-obligor   700,000,000        
Ferrellgas Finance Corp. [Member] | Fixed rate 8.625% Due 2020            
Loss Contingencies [Line Items]            
Aggregate principal amount   $ 357,000,000        
Ferrellgas, L.P. [Member]            
Loss Contingencies [Line Items]            
Number of quarters for required fixed charge coverage ratio | item   4        
Required fixed charge coverage ratio   175.00%        
Current fixed charge coverage ratio   167.00%        
Ferrellgas, L.P. [Member] | Fixed rate 8.625% Due 2020            
Loss Contingencies [Line Items]            
Aggregate principal amount   $ 357,000,000        
Ferrellgas, L.P. [Member] | Fixed rate 6.5% Due 2021            
Loss Contingencies [Line Items]            
Aggregate principal amount   500,000,000       $ 500,000,000
Ferrellgas, L.P. [Member] | Fixed rate 6.75% Due 2023            
Loss Contingencies [Line Items]            
Aggregate principal amount   500,000,000   $ 500,000,000    
Ferrellgas, L.P. [Member] | Fixed rate 6.75% Due 2022            
Loss Contingencies [Line Items]            
Aggregate principal amount         $ 475,000,000  
Ferrellgas, L.P. [Member] | Fixed rate 10.00% Due 2025            
Loss Contingencies [Line Items]            
Aggregate principal amount   $ 700,000,000        
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 | item 11          
Number of cases | item 24 13        
Ferrellgas, L.P. [Member] | Lawsuit Related To Sale Of Jamex Transfer Services [Member]            
Loss Contingencies [Line Items]            
Number of former officers | item   2