v3.20.4
Voluntary Reorganization (Narrative) (Details) - USD ($)
3 Months Ended
Jul. 23, 2020
Oct. 31, 2020
Sep. 20, 2019
Feb. 28, 2018
Restructuring Cost and Reserve [Line Items]        
Payment for Debt Extinguishment or Debt Prepayment Cost   $ 20,400,000    
Liabilities Subject to Compromise, Capital Lease Obligations and Accrued Interest   $ 18,300,000    
Revolving Credit Facility [Member]        
Restructuring Cost and Reserve [Line Items]        
Debt maximum borrowing capacity       $ 500,000,000
Debtor-in-Possession Term Loan Credit Facility (DIP Term Facility) | Secured Debt | Base Rate        
Restructuring Cost and Reserve [Line Items]        
Interest rate spread (basis points) 10.75%      
Debtor-in-Possession Term Loan Credit Facility (DIP Term Facility) | Secured Debt | London Interbank Offered Rate (LIBOR)        
Restructuring Cost and Reserve [Line Items]        
Interest rate spread (basis points) 11.75%      
Debtor-in-Possession Term Loan Credit Facility (DIP Term Facility) | Secured Debt | Applicable Rate        
Restructuring Cost and Reserve [Line Items]        
Default rate spread (percent) 2.00%      
Debtor-in-Possession Term Loan Credit Facility (DIP Term Facility) | Secured Debt | Minimum | Base Rate        
Restructuring Cost and Reserve [Line Items]        
Stated base rate (percent) 2.00%      
Debtor-in-Possession Term Loan Credit Facility (DIP Term Facility) | Secured Debt | Minimum | London Interbank Offered Rate (LIBOR)        
Restructuring Cost and Reserve [Line Items]        
Stated base rate (percent) 1.00%      
Last Out Exit Term Facility | Secured Debt        
Restructuring Cost and Reserve [Line Items]        
Funds owed on conversion $ 88,200,000      
Restructuring Support Agreement (RSA)        
Restructuring Cost and Reserve [Line Items]        
Capital to be contributed 150,000,000      
Amount available to holders of general unsecured claims $ 500,000      
Consenting Stakeholders        
Restructuring Cost and Reserve [Line Items]        
Ownership (percent) 44.90%      
Consenting Stakeholders | Term Loan        
Voluntary Reorganization [Abstract]        
Concentration risk (percent) 68.00%      
Restructuring Cost and Reserve [Line Items]        
Concentration risk (percent) 68.00%      
Backstop Parties | Debtor-in-Possession Term Loan Credit Facility (DIP Term Facility) | Secured Debt        
Restructuring Cost and Reserve [Line Items]        
Premium paid for line of credit facility $ 7,500,000      
Debt 312,300,000      
Backstop Parties | Debtor-in-Possession Term Loan Credit Facility (DIP Term Facility) | Secured Debt | Revolving Credit Facility [Member]        
Restructuring Cost and Reserve [Line Items]        
Debt maximum borrowing capacity 400,000,000   $ 200,000,000  
Backstop Parties | New Money DIP Loans | Secured Debt        
Restructuring Cost and Reserve [Line Items]        
Debt 150,000,000.0      
Payment for Debt Extinguishment or Debt Prepayment Cost 50,000,000.0      
Backstop Parties | Roll-Up DIP Loans | Secured Debt        
Restructuring Cost and Reserve [Line Items]        
Debt $ 162,300,000      
Term Loan Lenders        
Restructuring Cost and Reserve [Line Items]        
Ownership (percent) 55.10%