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Debt Debt (Fixed Charge Coverage Ratio) (Details) - $ / shares
3 Months Ended 12 Months Ended
Feb. 23, 2017
Jul. 31, 2018
Apr. 30, 2017
Oct. 31, 2016
Jul. 31, 2016
Distribution Made to Limited Partner, Distributions Declared, Per Unit       $ 0.40 $ 2.05
Debt Instrument, Covenant Description     43.9    
Required fixed charge coverage ratio     175.00%    
Current fixed charge coverage ratio     177.00%    
Debt Instrument, Covenant Compliance     340.2   8.1
Ferrellgas, L.P. [Member]          
Distribution Made to Limited Partner, Distributions Declared, Per Unit       $ 0.40 $ 2.05
Debt Instrument, Covenant Description     43.9    
Debt Instrument, Covenant Compliance     340.2   8.1
Subsequent Event [Member]          
Distribution Made to Limited Partner, Distributions Declared, Per Unit $ 0.10        
Interest Coverage Covenant [Member]          
Debt Instrument, Covenant Description     61.5    
Debt Instrument, Covenant Compliance     35.2    
Interest Coverage Covenant [Member] | Ferrellgas, L.P. [Member]          
Debt Instrument, Covenant Description     61.5    
Debt Instrument, Covenant Compliance     35.2    
Fixed Charge Coverage Covenant [Member]          
Debt Instrument, Covenant Description     2.7    
Debt Instrument, Restrictive Covenants   50.0      
Debt Instrument, Covenant Compliance     1.5