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Debt - Long-Term Debt (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2017
Jul. 31, 2019
Jul. 31, 2018
Jun. 30, 2015
Jul. 31, 2014
May 31, 2012
Apr. 30, 2011
Nov. 30, 2010
Apr. 30, 2010
Debt Instrument [Line Items]                  
Short-term borrowings   $ 43,000 $ 32,800            
Maturity period prior to maturity of bonds   90 days              
Fixed Rate 6.5% Due 2021                  
Debt Instrument [Line Items]                  
Interest rate, as a percent     6.50%     6.50%   6.50%  
Aggregate principal amount           $ 500,000   $ 500,000  
Fixed Rate 6.75% Due 2023                  
Debt Instrument [Line Items]                  
Interest rate, as a percent     6.75% 6.75%          
Aggregate principal amount       $ 500,000          
Fixed Rate 6.75% Due 2022                  
Debt Instrument [Line Items]                  
Interest rate, as a percent   6.75%     6.75%        
Debt Instrument, Unamortized Premium   $ 1,633 $ 2,375            
Aggregate principal amount         $ 475,000        
Fixed Rate 8.625% Due 2020                  
Debt Instrument [Line Items]                  
Interest rate, as a percent 8.625% 8.625%              
Debt issued premium, percent of par 96.00%                
Debt Instrument, Unamortized Discount   $ 1,319 3,766            
Net proceeds $ 166,100                
Aggregate principal amount $ 175,000 357,000             $ 280,000
Amount redeemed             $ 98,000    
Notes payable Due 2020 to 2029                  
Debt Instrument [Line Items]                  
Debt Instrument, Unamortized Discount   $ 711 $ 977            
Debt, Weighted Average Interest Rate   10.70% 11.20%            
Senior Secured Credit Facility Entered 2018 May [Member]                  
Debt Instrument [Line Items]                  
Maturity period prior to maturity of bonds   90 days              
Variable interest Revolving Facility                  
Debt Instrument [Line Items]                  
Short-term borrowings   $ 43,000 $ 32,800            
Debt, Weighted Average Interest Rate   9.47% 9.75%            
Ferrellgas, L.P. [Member]                  
Debt Instrument [Line Items]                  
Short-term borrowings   $ 43,000 $ 32,800            
Ferrellgas, L.P. [Member] | Fixed Rate 6.5% Due 2021                  
Debt Instrument [Line Items]                  
Interest rate, as a percent   6.50%       6.50%   6.50%  
Aggregate principal amount           $ 500,000   $ 500,000  
Ferrellgas, L.P. [Member] | Fixed Rate 6.75% Due 2023                  
Debt Instrument [Line Items]                  
Interest rate, as a percent   6.75%   6.75%          
Aggregate principal amount   $ 500,000   $ 500,000          
Ferrellgas, L.P. [Member] | Fixed Rate 6.75% Due 2022                  
Debt Instrument [Line Items]                  
Interest rate, as a percent   6.75%     6.75%        
Debt Instrument, Unamortized Premium   $ 1,633 2,375            
Aggregate principal amount         $ 475,000        
Ferrellgas, L.P. [Member] | Notes payable Due 2020 to 2029                  
Debt Instrument [Line Items]                  
Debt Instrument, Unamortized Discount   $ 711 $ 977            
Debt, Weighted Average Interest Rate   10.70% 11.20%            
Ferrellgas, L.P. [Member] | Senior Secured Credit Facility Entered 2018 May [Member]                  
Debt Instrument [Line Items]                  
Maturity period prior to maturity of bonds   90 days              
Ferrellgas, L.P. [Member] | Variable interest Revolving Facility                  
Debt Instrument [Line Items]                  
Short-term borrowings   $ 43,000 $ 32,800            
Debt, Weighted Average Interest Rate   9.47% 9.75%