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Contingencies And Commitments (Narrative) (Details) - $ / shares
3 Months Ended 12 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Jul. 31, 2017
Jul. 31, 2016
Required fixed charge coverage ratio 175.00%      
Current fixed charge coverage ratio 144.00%      
Debt Instrument, Covenant Compliance 40.6   67.5  
Debt Instrument, Covenant Description 5.2      
Distribution Made to Limited Partner, Distributions Declared, Per Unit $ 0.10 $ 0.40   $ 2.05
Ferrellgas Partners Finance Corp. [Member]        
Required fixed charge coverage ratio 175.00%      
Debt Instrument, Restrictive Covenants 50.0      
Current fixed charge coverage ratio 144.00%      
Debt Instrument, Covenant Compliance 9.8      
Debt Instrument, Covenant Description 30.4      
Distribution Made to Limited Partner, Distributions Declared, Per Unit $ 0.10      
Ferrellgas, L.P. [Member]        
Debt Instrument, Covenant Compliance 40.6   67.5  
Debt Instrument, Covenant Description 5.2      
Distribution Made to Limited Partner, Distributions Declared, Per Unit $ 0.40 $ 2.05