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Debt Arrangements - Narrative (Details) - USD ($)
Jun. 17, 2020
Jun. 30, 2020
Jun. 29, 2020
May 19, 2020
May 18, 2020
Mar. 31, 2020
Debt Instrument [Line Items]            
Outstanding amount of debt instrument   $ 1,568,414,000       $ 1,489,521,000
Credit Facility | Credit Facility            
Debt Instrument [Line Items]            
Outstanding amount of debt instrument   $ 0       $ 44,900,000
Foreign Seasonal Lines of Credit with Standard Bank of South Africa Limited | Foreign Line of Credit            
Debt Instrument [Line Items]            
Maximum borrowing capacity       $ 85,000,000 $ 105,000,000  
Foreign Seasonal Lines of Credit with Eastern and Southern African Trade and Development Bank | Foreign Line of Credit            
Debt Instrument [Line Items]            
Maximum borrowing capacity     $ 255,000,000      
DIP Credit Agreement | DIP Term Loan Facility            
Debt Instrument [Line Items]            
DIP financing, borrowings outstanding $ 131,700,000          
LIBOR floor (as a percent) 1.50%          
Ticking fee (as a percent) 3.00%          
Additional interest rate in event of default (as a percent) 2.00%          
DIP Credit Agreement | DIP Term Loan Facility | Base Rate            
Debt Instrument [Line Items]            
Basis spread on variable rate (as a percent) 9.25%          
DIP Credit Agreement | DIP Term Loan Facility | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Basis spread on variable rate (as a percent) 10.25%