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Debt - Senior Secured Credit Facilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2017
May 04, 2018
Jan. 31, 2017
Jul. 31, 2014
Apr. 30, 2010
Debt Instrument [Line Items]              
Maturity period prior to maturity of bonds 90 days            
Prepayment as percentage of excess cash flow 50.00%            
Financial information delivery period 55 days            
Term Loan, current $ 275,000            
Short-term borrowings 43,000 $ 32,800          
Long-term debt 1,457,004 2,078,637          
Letters of credit outstanding 101,900 107,900          
Line of credit facility, commitment fee $ 1,000 $ 700 $ 1,100        
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) 9.47% 9.75%          
Short-term borrowings $ 43,000 $ 32,800          
Available borrowing capacity 155,100 159,300          
Letter of Credit [Member]              
Debt Instrument [Line Items]              
Secured line of credit facility 125,000            
Available borrowing capacity 23,100 17,100          
Variable interest Term Loan Due 2023              
Debt Instrument [Line Items]              
Senior secured term loan $ 275,000 $ 275,000          
Margin added to variable rate (as a percent) 5.75%            
Term Loan, current $ 275,000            
Interest rate at period end 8.16% 7.86%          
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   $ 280,000
Ferrellgas, L.P. [Member]              
Debt Instrument [Line Items]              
Prepayment as percentage of excess cash flow 50.00%            
Financial information delivery period 55 days            
Term Loan, current $ 275,000            
Short-term borrowings 43,000 $ 32,800          
Available borrowing capacity 23,100            
Long-term debt 1,457,004 1,728,137          
Letters of credit outstanding 101,900 107,900          
Line of credit facility, commitment fee $ 1,000 $ 700 $ 1,100        
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            
Margin added to variable rate (as a percent) 4.75%            
Weighted average interest rate (as a percent) 9.47% 9.75%          
Short-term borrowings $ 43,000 $ 32,800          
Available borrowing capacity 155,100 159,300          
Ferrellgas, L.P. [Member] | Letter of Credit [Member]              
Debt Instrument [Line Items]              
Secured line of credit facility 125,000            
Available borrowing capacity   17,100          
Ferrellgas, L.P. [Member] | Variable interest Term Loan Due 2023              
Debt Instrument [Line Items]              
Senior secured term loan 275,000 $ 275,000          
Term Loan, current $ 275,000            
Interest rate at period end 8.16% 7.86%          
Ferrellgas, L.P. [Member] | Fixed Rate 6.75% Due 2022              
Debt Instrument [Line Items]              
Aggregate principal amount           $ 475,000