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Debt (Secured Credit Facility Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Jul. 31, 2018
Apr. 30, 2018
Jan. 31, 2018
Oct. 31, 2017
Oct. 31, 2016
Jul. 31, 2017
Jul. 31, 2016
Debt Instrument [Line Items]              
Debt Instrument, Covenant Description       5.2      
Distribution Made to Limited Partner, Distributions Declared, Per Unit       $ 0.10 $ 0.40   $ 2.05
required total leverage ratio 550.00%            
Line of Credit Facility, Covenant Compliance       9.8   10  
current leverage ratio       757.00%      
Debt Instrument, Covenant Compliance       40.6   67.5  
Available borrowing capacity       $ 139.8   $ 190.3  
Letters of credit outstanding       $ 172.0   $ 139.2  
Ferrellgas, L.P. [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Covenant Description       5.2      
Distribution Made to Limited Partner, Distributions Declared, Per Unit       $ 0.40 $ 2.05    
required total leverage ratio       550.00%      
Line of Credit Facility, Covenant Compliance       9.8   10  
current leverage ratio       757.00%      
Debt Instrument, Covenant Compliance       40.6   67.5  
Available borrowing capacity       $ 139.8   $ 190.3  
Letters of credit outstanding       172.0   139.2  
Secured Credit Facility [Member]              
Debt Instrument [Line Items]              
Total credit faciltiy borrowings outstanding       $ 263.2   245.5  
Other Long-term Debt, Noncurrent           $ 185.7  
Weighted average interest rate on credit facility borrowings       5.90%   6.00%  
Line of Credit Facility, Maximum Borrowing Capacity       $ 575.0   $ 700.0  
Secured Credit Facility [Member] | Ferrellgas, L.P. [Member]              
Debt Instrument [Line Items]              
Total credit faciltiy borrowings outstanding       $ 263.2   245.5  
Other Long-term Debt, Noncurrent           $ 185.7  
Weighted average interest rate on credit facility borrowings       5.90%   6.00%  
Line of Credit Facility, Maximum Borrowing Capacity       $ 575.0   $ 700.0  
Letter Of Credit [Member]              
Debt Instrument [Line Items]              
Available borrowing capacity       28.0   60.8  
Letter Of Credit [Member] | Ferrellgas, L.P. [Member]              
Debt Instrument [Line Items]              
Available borrowing capacity       $ 28.0   $ 60.8  
Minimum [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate Terms       0.035      
loan pricing leverage ratio covenant       600.00%      
Line of Credit Facility, Covenant Terms       50      
Minimum [Member] | Ferrellgas, L.P. [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate Terms       0.035      
loan pricing leverage ratio covenant       600.00%      
Line of Credit Facility, Covenant Terms       50      
Maximum [Member]              
Debt Instrument [Line Items]              
required total leverage ratio 550.00% 775.00% 775.00% 775.00%      
Debt Instrument, Interest Rate Terms       0.04      
loan pricing leverage ratio covenant       700.00%      
Line of Credit Facility, Covenant Terms       200      
Maximum [Member] | Ferrellgas, L.P. [Member]              
Debt Instrument [Line Items]              
required total leverage ratio 550.00% 775.00% 775.00% 775.00%      
Debt Instrument, Interest Rate Terms       0.04      
loan pricing leverage ratio covenant       700.00%      
Line of Credit Facility, Covenant Terms       200      
Credit Facility [Domain] | Minimum [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate Terms       0.035      
Credit Facility [Domain] | Minimum [Member] | Ferrellgas, L.P. [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate Terms       0.035      
Credit Facility [Domain] | Maximum [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate Terms       0.0375      
Credit Facility [Domain] | Maximum [Member] | Ferrellgas, L.P. [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate Terms       0.0375