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Contingencies And Commitments (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 02, 2017
item
Aug. 31, 2019
USD ($)
item
Apr. 30, 2019
Jul. 31, 2019
USD ($)
item
Jul. 31, 2018
USD ($)
Jul. 31, 2017
USD ($)
Loss Contingencies [Line Items]            
Settlement paid   $ 6,250,000        
Number of claims dismissed | item   11        
Number of cases | item   13   24    
Number of former officers | item 2          
Business Exit Costs       $ 0 $ 11,804,000 $ 0
Transportation Equipment [Member]            
Loss Contingencies [Line Items]            
Expiration period       7 years    
Guarantor Obligations, Current Carrying Value       $ 1,500,000    
Potential liability as co-issuer and co-obligor       9,600,000    
Property And Equipment [Member]            
Loss Contingencies [Line Items]            
Rental expense       53,800,000 50,700,000 50,000,000
Ferrellgas Partners Finance Corp. [Member]            
Loss Contingencies [Line Items]            
Potential liability as co-issuer and co-obligor       357,000,000    
Ferrellgas Finance Corp. [Member] | Fixed Rate 6.5% Due 2021            
Loss Contingencies [Line Items]            
Guarantor Obligations, Current Carrying Value       500,000,000    
Ferrellgas Finance Corp. [Member] | Fixed Rate 6.75% Due 2023            
Loss Contingencies [Line Items]            
Guarantor Obligations, Current Carrying Value       500,000,000    
Ferrellgas Finance Corp. [Member] | Fixed Rate 6.75% Due 2022            
Loss Contingencies [Line Items]            
Guarantor Obligations, Current Carrying Value       $ 475,000,000    
Ferrellgas, L.P. [Member]            
Loss Contingencies [Line Items]            
Settlement paid   $ 6,250,000        
Number of claims dismissed | item   11        
Number of cases | item   13   24    
Number of former officers | item 2          
Number of quarters for required fixed charge coverage ratio       4    
Required fixed charge coverage ratio       175.00%    
Current fixed charge coverage ratio       167.00%    
Business Exit Costs       $ 0 11,804,000 0
Ferrellgas, L.P. [Member] | Maximum [Member]            
Loss Contingencies [Line Items]            
Current fixed charge coverage ratio     175.00%      
Ferrellgas, L.P. [Member] | Transportation Equipment [Member]            
Loss Contingencies [Line Items]            
Expiration period       7 years    
Guarantor Obligations, Current Carrying Value       $ 1,500,000    
Potential liability as co-issuer and co-obligor       9,600,000    
Ferrellgas, L.P. [Member] | Property And Equipment [Member]            
Loss Contingencies [Line Items]            
Rental expense       $ 53,800,000 $ 50,700,000 $ 50,000,000