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Debt - Forbearance and Covenants (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Jun. 07, 2020
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jul. 31, 2020
USD ($)
Jul. 31, 2020
USD ($)
item
Apr. 30, 2020
Apr. 16, 2020
Jul. 31, 2019
USD ($)
Jan. 31, 2017
Debt Instrument [Line Items]                        
Dividends allowed             $ 0          
Fixed Rate Eight Point Six Two Five Due Two Thousand Twenty [Member]                        
Debt Instrument [Line Items]                        
Interest rate, as a percent 8.625%           8.625% 8.625%     8.625% 8.625%
Aggregate principal percentage under forbearance 77.00%                      
Unsecured senior notes             $ 357,000,000 $ 357,000,000     $ 355,681,000  
Fixed rate 10.00% Due 2025                        
Debt Instrument [Line Items]                        
Interest rate, as a percent             10.00% 10.00% 10.00% 10.00%    
Maximum [Member]                        
Debt Instrument [Line Items]                        
Current fixed charge coverage ratio   175.00% 175.00% 175.00% 175.00% 175.00%            
Required leverage ratio               5.5        
Minimum [Member]                        
Debt Instrument [Line Items]                        
Required fixed charge coverage ratio               175.00%        
Ferrellgas Partners LP [Member]                        
Debt Instrument [Line Items]                        
Number of quarters for required fixed charge coverage ratio | item               4        
Maximum restricted payments               $ 50,000,000        
Number of quarters for restricted payments | item               16        
Current fixed charge coverage ratio               140.00%        
Ferrellgas Partners LP [Member] | Minimum [Member]                        
Debt Instrument [Line Items]                        
Required fixed charge coverage ratio               175.00%        
Ferrellgas, L.P. [Member]                        
Debt Instrument [Line Items]                        
Number of quarters for required fixed charge coverage ratio               4        
Number of quarters for restricted payments | item               4        
Current fixed charge coverage ratio               170.00%        
Ferrellgas, L.P. [Member] | Fixed Rate Eight Point Six Two Five Due Two Thousand Twenty [Member]                        
Debt Instrument [Line Items]                        
Interest rate, as a percent 8.625%           8.625% 8.625%        
Aggregate principal percentage under forbearance 77.00%                      
Unsecured senior notes             $ 357,000,000 $ 357,000,000        
Ferrellgas, L.P. [Member] | Fixed rate 10.00% Due 2025                        
Debt Instrument [Line Items]                        
Interest rate, as a percent             10.00% 10.00% 10.00% 10.00%    
Ferrellgas, L.P. [Member] | Maximum [Member]                        
Debt Instrument [Line Items]                        
Required leverage ratio               5.5        
Ferrellgas, L.P. [Member] | Minimum [Member]                        
Debt Instrument [Line Items]                        
Required fixed charge coverage ratio               175.00%        
Current fixed charge coverage ratio               550.00%        
Senior secured leverage ratio             5.5 5.5