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Long-term Debt - Textuals (Details)
3 Months Ended 9 Months Ended
Apr. 11, 2018
USD ($)
Dec. 29, 2017
USD ($)
Sep. 18, 2017
USD ($)
Sep. 15, 2017
USD ($)
Jul. 31, 2017
USD ($)
Mar. 31, 2018
USD ($)
Jun. 30, 2017
USD ($)
Apr. 01, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Apr. 03, 2017
USD ($)
Feb. 15, 2017
USD ($)
Senior Notes | Effect of Plan | 6.000% Senior Secured Notes due March 2022                        
Debt Instrument [Line Items]                        
Principal amount                       $ 500,000,000.0
Senior Notes | Effect of Plan | 6.000% Senior Secured Notes due March 2022                        
Debt Instrument [Line Items]                        
Principal amount                       $ 500,000,000.0
Term Loan | Successor Credit Agreement                        
Debt Instrument [Line Items]                        
Restricted payments threshold     $ 50,000,000.0             $ 450,000,000.0    
Debt Instrument, Restricted Payments Basket     $ 450,000,000                  
Debt Instrument, Covenant, Fixed Charge Coverage Ratio           2.25       2.00    
Term Loan | Successor Credit Agreement | Subsequent Event                        
Debt Instrument [Line Items]                        
Debt Instrument, Fee Amount $ 2,000,000                      
Payment for Debt Extinguishment or Debt Prepayment Cost $ 46,000,000                      
Term Loan | Successor Credit Agreement | Total Leverage Ration Less Or Equal 2.00 to 1.00                        
Debt Instrument [Line Items]                        
Total Leverage Ratio           2.00            
Term Loan | Successor Credit Agreement | Total Leverage Ratio Less or Equal 1.25 to 1.00                        
Debt Instrument [Line Items]                        
Total Leverage Ratio           1.25            
Dividend payment and stock purchase payment threshold           $ 25,000,000            
Term Loan | Effect of Plan | Successor Credit Agreement                        
Debt Instrument [Line Items]                        
Principal amount                     $ 950,000,000  
Successor                        
Debt Instrument [Line Items]                        
Debt issuance cost           56,900,000       $ 59,400,000    
Interest expense           36,300,000            
Capital lease obligations           67,800,000       76,000,000    
Successor | Revolving Credit Facility | 2017 Revolver                        
Debt Instrument [Line Items]                        
Debt issuance cost                   4,700,000    
Interest expense           $ 1,800,000            
Line of Credit Facility, Maximum Borrowing Capacity                   350,000,000    
Unrestricted Cash Netting Limit                   800,000,000    
Revolving Credit Facility, Fee on Unused Borrowings           0.50%            
Aggregate Letters of Credit, Maximum                   $ 163,100,000    
Successor | Revolving Credit Facility | 2017 Revolver | Total Leverage Ration Less Or Equal 2.00 to 1.00                        
Debt Instrument [Line Items]                        
Total Leverage Ratio                   2.00    
Successor | Revolving Credit Facility | 2017 Revolver | London Interbank Offered Rate (LIBOR)                        
Debt Instrument [Line Items]                        
Basis spread on variable rate           2.75%       3.25%    
Successor | Revolving Credit Facility | Letter of Credit                        
Debt Instrument [Line Items]                        
Debt Instrument, Base Interest Rate                   3.375%    
Successor | Senior Notes | 6.000% Senior Secured Notes due March 2022                        
Debt Instrument [Line Items]                        
Stated interest rate           6.00%       6.00%    
Long-term debt           $ 500,000,000       $ 500,000,000    
Successor | Senior Notes | 6.000% Senior Secured Notes due March 2022 | Debt Instrument, Redemption, Period One                        
Debt Instrument [Line Items]                        
Redemption price, percentage           103.00%            
Successor | Senior Notes | 6.000% Senior Secured Notes due March 2022 | Debt Instrument, Redemption, Period Two                        
Debt Instrument [Line Items]                        
Redemption price, percentage           101.50%            
Successor | Senior Notes | 6.000% Senior Secured Notes due March 2022                        
Debt Instrument [Line Items]                        
Stated interest rate           6.375%       6.375%    
Long-term debt           $ 500,000,000       $ 500,000,000    
Successor | Senior Notes | 6.000% Senior Secured Notes due March 2022 | Debt Instrument, Redemption, Period One                        
Debt Instrument [Line Items]                        
Redemption price, percentage           104.80%            
Successor | Senior Notes | 6.000% Senior Secured Notes due March 2022 | Debt Instrument, Redemption, Period Two                        
Debt Instrument [Line Items]                        
Redemption price, percentage           103.20%            
Successor | Senior Notes | 6.000% Senior Secured Notes due March 2022 | Debt Instrument, Redemption, Period Three                        
Debt Instrument [Line Items]                        
Redemption price, percentage           101.60%            
Successor | Senior Notes | 6.00% And 6.375% Senior Secured Notes, Successor Notes                        
Debt Instrument [Line Items]                        
Debt issuance cost             $ 49,500,000          
Interest expense           $ 17,500,000            
Successor | Senior Notes | 6.00% And 6.375% Senior Secured Notes, Successor Notes | Domestic                        
Debt Instrument [Line Items]                        
Collateral, capital stock, percent           100.00%            
Successor | Senior Notes | 6.00% And 6.375% Senior Secured Notes, Successor Notes | Export                        
Debt Instrument [Line Items]                        
Collateral, non-voting capital stock, percent           100.00%            
Collateral, voting capital stock, percent           65.00%            
Successor | Senior Notes | 6.00% And 6.375% Senior Secured Notes, Successor Notes | Peabody Investments (Gibraltar) Limited                        
Debt Instrument [Line Items]                        
Collateral, non-voting capital stock, percent           100.00%            
Collateral, voting capital stock, percent           65.00%            
Successor | Term Loan | Successor Credit Agreement                        
Debt Instrument [Line Items]                        
Interest expense           $ 6,600,000            
Principal amount             450,000,000          
Original issue discount and deferred finance costs             $ 37,300,000          
Mandatory principal prepayment, percent of excess cash flow           75.00%            
Mandatory principal prepayment, if required, period payable, threshold           100 days            
Excess proceeds from sales of assets, threshold ($10 million or greater)           $ 10,000,000            
Payment for Debt Extinguishment or Debt Prepayment Cost   $ 200,000,000   $ 500,000,000 $ 150,000,000              
Successor | Term Loan | Successor Credit Agreement | Total Leverage Ratio Less or Equal to 2.00 to 1.00 Greater Than 1.50 to 1.00                        
Debt Instrument [Line Items]                        
Mandatory principal prepayment, percent of excess cash flow           50.00%            
Successor | Term Loan | Successor Credit Agreement | Total Leverage Ratio Less or Equal to 2.00 to 1.00 Greater Than 1.50 to 1.00 | Maximum                        
Debt Instrument [Line Items]                        
Total Leverage Ratio           2.00            
Successor | Term Loan | Successor Credit Agreement | Total Leverage Ratio Less or Equal to 2.00 to 1.00 Greater Than 1.50 to 1.00 | Minimum                        
Debt Instrument [Line Items]                        
Total Leverage Ratio           1.50            
Successor | Term Loan | Successor Credit Agreement | Total Leverage Ratio Less or Equal to 1.50 to 1.00 Greater Than 1.00 to 1.00                        
Debt Instrument [Line Items]                        
Mandatory principal prepayment, percent of excess cash flow           25.00%            
Successor | Term Loan | Successor Credit Agreement | Total Leverage Ratio Less or Equal to 1.50 to 1.00 Greater Than 1.00 to 1.00 | Maximum                        
Debt Instrument [Line Items]                        
Total Leverage Ratio           1.50            
Successor | Term Loan | Successor Credit Agreement | Total Leverage Ratio Less or Equal to 1.50 to 1.00 Greater Than 1.00 to 1.00 | Minimum                        
Debt Instrument [Line Items]                        
Total Leverage Ratio           1.00            
Successor | Term Loan | Successor Credit Agreement | Total Leverage Ratio Less or Equal to 1.00 to 1.00                        
Debt Instrument [Line Items]                        
Mandatory principal prepayment, percent of excess cash flow           0.00%            
Total Leverage Ratio           1.00            
Successor | Term Loan | Successor Credit Agreement | London Interbank Offered Rate (LIBOR)                        
Debt Instrument [Line Items]                        
Basis spread on variable rate     3.50%     3.50% 4.50%          
Floor interest rate           1.00% 1.00%     1.00%    
Successor | Term Loan | Senior Secured Term Loan due 2025                        
Debt Instrument [Line Items]                        
Long-term debt           $ 444,300,000       $ 444,200,000    
Secured Debt                   950,000,000.0    
Successor | Line of Credit | 2017 Revolver | Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Long-term debt                   $ 350,000,000    
Predecessor                        
Debt Instrument [Line Items]                        
Interest expense, adequate protection payments               $ 29,800,000        
Contractual interest expense               $ 92,900,000        
Interest expense                 $ 32,900,000