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Debt - Long-Term Debt Activity (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2017
Oct. 31, 2019
Jan. 31, 2020
Jul. 31, 2019
Jan. 31, 2019
Jun. 30, 2015
Jul. 31, 2014
Mar. 31, 2011
Nov. 30, 2010
Apr. 30, 2010
Debt Instrument [Line Items]                    
Short-term borrowings     $ 40,000 $ 43,000            
Capitalized financing cost     $ 8,863              
Fixed Rate 6.5% Due 2021                    
Debt Instrument [Line Items]                    
Interest rate, as a percent         6.50%       6.50%  
Aggregate principal amount                 $ 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%      
Unamortized premium     $ 1,280 1,633            
Aggregate principal amount             $ 475,000      
Fixed Rate 8.625% Due 2020                    
Debt Instrument [Line Items]                    
Interest rate, as a percent 8.625%   8.625%              
Issuance price as percent of par 96.00%                  
Unamortized discount     $ 0 1,319            
Net proceeds $ 166,100                  
Aggregate principal amount $ 175,000   357,000              
Notes payable Due 2020 to 2029                    
Debt Instrument [Line Items]                    
Unamortized discount     $ 577 $ 711            
Weighted average interest rate (as a percent)     9.50% 10.70%            
Aggregate principal amount                   $ 280,000
Amount redeemed               $ 98,000    
Senior Secured Credit Facility Entered 2018 May [Member]                    
Debt Instrument [Line Items]                    
Maturity period prior to maturity of bonds     90 days              
Capitalized financing cost   $ 8,900                
Variable interest Revolving Facility                    
Debt Instrument [Line Items]                    
Short-term borrowings     $ 40,000 $ 43,000            
Weighted average interest rate (as a percent)     7.54%              
Interest rate at period end       9.47%            
Ferrellgas, L.P. [Member]                    
Debt Instrument [Line Items]                    
Short-term borrowings     $ 40,000 $ 43,000            
Maturity period prior to maturity of bonds     90 days              
Capitalized financing cost     $ 8,863              
Ferrellgas, L.P. [Member] | Fixed Rate 6.5% Due 2021                    
Debt Instrument [Line Items]                    
Interest rate, as a percent     6.50%           6.50%  
Aggregate principal amount                 $ 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%      
Unamortized premium     $ 1,280 1,633            
Aggregate principal amount             $ 475,000      
Ferrellgas, L.P. [Member] | Fixed Rate 8.625% Due 2020                    
Debt Instrument [Line Items]                    
Aggregate principal amount     357,000              
Ferrellgas, L.P. [Member] | Notes payable Due 2020 to 2029                    
Debt Instrument [Line Items]                    
Unamortized discount     $ 577 $ 711            
Weighted average interest rate (as a percent)     9.50% 10.70%            
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              
Capitalized financing cost   $ 8,900                
Ferrellgas, L.P. [Member] | Variable interest Revolving Facility                    
Debt Instrument [Line Items]                    
Short-term borrowings     $ 40,000 $ 43,000            
Interest rate at period end     7.54% 9.47%