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Debt - Secured Credit Facilities (Details) - USD ($)
$ in Thousands
6 Months Ended
Jan. 31, 2020
Nov. 07, 2019
Jul. 31, 2019
May 04, 2018
Jan. 31, 2017
Jul. 31, 2014
Debt Instrument [Line Items]            
Prepayment as percentage of excess cash flow 50.00%          
Short-term borrowings $ 40,000   $ 43,000      
Long-term debt 1,731,197   1,457,004      
Letters of credit outstanding 120,900   $ 101,900      
Senior Secured Credit Facility Entered 2018 May [Member]            
Debt Instrument [Line Items]            
Secured line of credit facility $ 575,000          
Maturity period prior to maturity of bonds 90 days          
Variable interest Revolving Facility            
Debt Instrument [Line Items]            
Secured line of credit facility $ 300,000          
Margin added to variable rate (as a percent) 4.75%          
Weighted average interest rate (as a percent) 7.54%          
Interest rate at period end     9.47%      
Short-term borrowings $ 40,000   $ 43,000      
Available borrowing capacity 139,100   155,100      
Letter of Credit [Member]            
Debt Instrument [Line Items]            
Secured line of credit facility 125,000 $ 140,000        
Available borrowing capacity 19,100   23,100      
Variable interest Term Loan Due 2023            
Debt Instrument [Line Items]            
Senior secured term loan $ 283,863   275,000 $ 275,000    
Margin added to variable rate (as a percent) 5.75%          
Term Loan, current $ 283,900   $ 275,000      
Interest rate at period end 7.54%   8.16%      
Fixed Rate 6.75% Due 2022            
Debt Instrument [Line Items]            
Aggregate principal amount           $ 475,000
Fixed Rate 8.625% Due 2020            
Debt Instrument [Line Items]            
Aggregate principal amount $ 357,000       $ 175,000  
Ferrellgas, L.P. [Member]            
Debt Instrument [Line Items]            
Maturity period prior to maturity of bonds 90 days          
Prepayment as percentage of excess cash flow 50.00%          
Short-term borrowings $ 40,000   $ 43,000      
Long-term debt 1,731,197   1,457,004      
Letters of credit outstanding $ 120,900   $ 101,900      
Ferrellgas, L.P. [Member] | Senior Secured Credit Facility Entered 2018 May [Member]            
Debt Instrument [Line Items]            
Secured line of credit facility       575,000    
Maturity period prior to maturity of bonds 90 days          
Ferrellgas, L.P. [Member] | Variable interest Revolving Facility            
Debt Instrument [Line Items]            
Secured line of credit facility $ 300,000     300,000    
Margin added to variable rate (as a percent) 4.75%          
Interest rate at period end 7.54%   9.47%      
Short-term borrowings $ 40,000   $ 43,000      
Available borrowing capacity 139,100   155,100      
Ferrellgas, L.P. [Member] | Letter of Credit [Member]            
Debt Instrument [Line Items]            
Secured line of credit facility 125,000 $ 140,000        
Available borrowing capacity 19,100   23,100      
Ferrellgas, L.P. [Member] | Variable interest Term Loan Due 2023            
Debt Instrument [Line Items]            
Senior secured term loan $ 283,863   275,000 $ 275,000    
Margin added to variable rate (as a percent) 5.75%          
Term Loan, current $ 283,900   $ 275,000      
Interest rate at period end 7.54%   8.16%      
Ferrellgas, L.P. [Member] | Fixed Rate 6.75% Due 2022            
Debt Instrument [Line Items]            
Aggregate principal amount           $ 475,000
Ferrellgas, L.P. [Member] | Fixed Rate 8.625% Due 2020            
Debt Instrument [Line Items]            
Aggregate principal amount $ 357,000