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Fresh Start Reporting - Gain on Discharge of Predecessor Second Lien Notes (Details) - USD ($)
$ in Thousands
1 Months Ended 5 Months Ended 6 Months Ended
Aug. 31, 2020
Sep. 30, 2020
Aug. 31, 2020
Sep. 30, 2021
Reorganization, Chapter 11 [Line Items]        
Debt subject to compromise $ 0   $ 0  
Accrued interest on debt subject to compromise 0   0  
Gain on discharge of second lien notes   $ 0 (828) $ 0
Predecessor        
Reorganization, Chapter 11 [Line Items]        
Debt subject to compromise 635,686   635,686  
Accrued interest on debt subject to compromise 26,156   26,156  
Reorganization Adjustments        
Reorganization, Chapter 11 [Line Items]        
Debt subject to compromise (635,686)   (635,686)  
Accrued interest on debt subject to compromise (26,156)   $ (26,156)  
Value of common stock issued to holders of second lien notes (391,402)      
Reorganization Adjustments | Predecessor Second Lien Notes        
Reorganization, Chapter 11 [Line Items]        
Total second lien notes discharged 661,842      
Payment to holders of second lien notes electing cash option (1,199)      
Value of common stock issued to holders of second lien notes (198,339)      
Gain on discharge of second lien notes $ 462,304