Transactions With Related Parties (Narrative) (Details)
$ in Thousands, shares in Millions
3 Months Ended 6 Months Ended
Jan. 31, 2016
USD ($)
employee
shares
Jan. 31, 2016
USD ($)
employee
Jan. 31, 2015
USD ($)
Jul. 31, 2015
USD ($)
Payments for Repurchase of Common Stock   $ (46,398) $ 0  
Number of employees | employee 0 0    
Ferrellgas, L.P. [Member]        
Number of employees | employee 0 0    
James H. Ballengee [Member]        
Limited partner ownership interest   6.60%    
James H. Ballengee [Member] | Ferrellgas, L.P. [Member]        
Limited partner ownership interest   6.60%    
Jamex Marketing, LLC [Member]        
Revenue from Related Parties $ 5,700 $ 10,100    
Related Party Costs 1,000 1,600    
Accounts Receivable, Related Parties 1,500 1,500   $ 4,800
Accounts Payable, Related Parties 100 100   4,200
Jamex Marketing, LLC [Member] | Ferrellgas, L.P. [Member]        
Revenue from Related Parties 5,700 10,100    
Related Party Costs 1,000 1,600    
Accounts Receivable, Related Parties 1,500 1,500   4,800
Accounts Payable, Related Parties $ 100 $ 100   $ 4,200
Subsequent Event [Member]        
Partners' Capital Account, Units, Treasury Units Purchased | shares 2.4      
Credit Facility [Domain] | Subsequent Event [Member]        
Payments for Repurchase of Common Stock $ 45,900