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Debt Debt (Fixed Charge Coverage Ratio) (Details) - $ / shares
3 Months Ended 6 Months Ended 12 Months Ended
Jan. 31, 2018
Oct. 31, 2017
Jan. 31, 2018
Jul. 31, 2017
Distribution Made to Limited Partner, Distributions Declared, Per Unit $ 0.10      
Debt Instrument, Covenant Description 24.9      
Required fixed charge coverage ratio 175.00%      
Current fixed charge coverage ratio 159.00%      
Debt Instrument, Covenant Compliance 193.2     67.5
Ferrellgas, L.P. [Member]        
Debt Instrument, Covenant Description 24.9      
Debt Instrument, Covenant Compliance 193.2     67.5
Subsequent Event [Member]        
Distribution Made to Limited Partner, Distributions Declared, Per Unit $ 0.10      
Interest Coverage Covenant [Member]        
Debt Instrument, Covenant Description 44.3      
Debt Instrument, Covenant Compliance 25.3      
Interest Coverage Covenant [Member] | Ferrellgas, L.P. [Member]        
Debt Instrument, Covenant Description 44.3      
Debt Instrument, Covenant Compliance 25.3      
Fixed Charge Coverage Covenant [Member]        
Debt Instrument, Covenant Description 20.6      
Debt Instrument, Restrictive Covenants     50.0  
Debt Instrument, Covenant Compliance 9.8 9.8