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Debt (Secured Credit Facility Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Nov. 22, 2016
Apr. 30, 2018
Jan. 31, 2018
Oct. 31, 2017
Jul. 31, 2017
Apr. 30, 2017
Jan. 31, 2017
Oct. 31, 2016
Jul. 31, 2017
Jul. 31, 2016
Debt Instrument [Line Items]                    
Debt Instrument, Covenant Description               0.04    
current leverage ratio               581.00%    
Debt Instrument, Covenant Compliance               78.9   8.1
Available borrowing capacity               $ 173.6   $ 219.3
Letters of credit outstanding               $ 111.4   $ 86.3
Ferrellgas, L.P. [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Covenant Description               .04    
current leverage ratio               581.00%    
Debt Instrument, Covenant Compliance               78.9   8.1
Available borrowing capacity               $ 173.6   $ 219.3
Letters of credit outstanding               111.4   86.3
Secured Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Total credit faciltiy borrowings outstanding               415.0   394.4
Other Long-term Debt, Noncurrent               $ 318.2   $ 293.1
Weighted average interest rate on credit facility borrowings               4.10%   3.70%
Secured Credit Facility [Member] | Ferrellgas, L.P. [Member]                    
Debt Instrument [Line Items]                    
Total credit faciltiy borrowings outstanding               $ 415.0   $ 394.4
Other Long-term Debt, Noncurrent               $ 318.2   $ 293.1
Weighted average interest rate on credit facility borrowings               4.10%   3.70%
Letter Of Credit [Member]                    
Debt Instrument [Line Items]                    
Available borrowing capacity               $ 88.6   $ 113.7
Letter Of Credit [Member] | Ferrellgas, L.P. [Member]                    
Debt Instrument [Line Items]                    
Available borrowing capacity               $ 88.6   $ 113.7
Minimum [Member]                    
Debt Instrument [Line Items]                    
required total leverage ratio   550.00% 550.00% 550.00% 550.00% 550.00% 550.00% 550.00%    
Minimum [Member] | Ferrellgas, L.P. [Member]                    
Debt Instrument [Line Items]                    
required total leverage ratio   550.00% 550.00% 550.00% 550.00% 550.00% 550.00% 550.00%    
Maximum [Member]                    
Debt Instrument [Line Items]                    
required total leverage ratio   550.00% 595.00% 595.00% 605.00% 595.00% 595.00% 605.00%    
Maximum [Member] | Ferrellgas, L.P. [Member]                    
Debt Instrument [Line Items]                    
required total leverage ratio   550.00% 595.00% 595.00% 605.00% 595.00% 595.00% 605.00%    
Subsequent Event [Member]                    
Debt Instrument [Line Items]                    
Distribution Made to Limited Partner, Distributions Declared, Per Unit $ 0.10               $ 0.40 $ 2.05
Subsequent Event [Member] | Ferrellgas, L.P. [Member]                    
Debt Instrument [Line Items]                    
Distribution Made to Limited Partner, Distributions Declared, Per Unit                 $ 0.40 $ 2.05