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Debt Securities (Details) - USD ($) | Sep. 18, 2017 | Apr. 03, 2017 | Apr. 01, 2017 | Feb. 15, 2017
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Fresh-Start Adjustment [Line Items] |  |  |  |
Fresh-Start Adjustment, Increase (Decrease), Long-term Debt |  |  | $ 950,000,000 |
Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Fresh-Start Adjustment, Increase (Decrease), Long-term Debt |  |  | $ 903,200,000 |
6.00% Senior Secured Notes due March 2022 | Senior Notes | Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Principal amount |  |  |  | $ 500,000,000.0
Stated interest rate |  |  |  | 6.00%
6.375% Senior Secured Notes due March 2025 | Senior Notes | Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Principal amount |  |  |  | $ 500,000,000.0
Stated interest rate |  |  |  | 6.375%
Successor Credit Agreement | Term Loan | Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Principal amount |  | $ 950,000,000 |  |
10.00% Senior Secured Second Lien Notes due March 2022 | Senior Notes | Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Stated interest rate |  |  | 10.00% |
Fresh-Start Adjustment, Increase (Decrease), Long-term Debt |  |  | $ (1,000,000,000.0) |
6.50% Senior Notes due September 2020 | Senior Notes | Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Stated interest rate |  |  | 6.50% |
Fresh-Start Adjustment, Increase (Decrease), Long-term Debt |  |  | $ (650,000,000.0) |
6.00% Senior Notes due November 2018 | Senior Notes | Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Stated interest rate |  |  | 6.00% |
Fresh-Start Adjustment, Increase (Decrease), Long-term Debt |  |  | $ (1,518,800,000.0) |
6.25% Senior Notes due November 2021 | Senior Notes | Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Stated interest rate |  |  | 6.25% |
Fresh-Start Adjustment, Increase (Decrease), Long-term Debt |  |  | $ (1,339,600,000.0) |
7.875% Senior Notes due November 2026 | Senior Notes | Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Stated interest rate |  |  | 7.875% |
Fresh-Start Adjustment, Increase (Decrease), Long-term Debt |  |  | $ (250,000,000.0) |
Convertible Junior Subordinated Debentures Due December 2006 [Member] | Subordinated Debt | Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Fresh-Start Adjustment, Increase (Decrease), Long-term Debt |  |  | (732,500,000.0) |
2013 Term Loan Facility | Term Loan | Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Credit facility canceled |  |  | 1,170,000,000 |
2013 Revolver | Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Credit facility canceled |  |  | 947,000,000 |
2013 Revolver | Revolving Credit Facility | Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Credit facility canceled |  |  | 1,650,000,000 |
2013 Revolver | Letter of credit | Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Credit facility canceled |  |  | $ 675,000,000 |
London Interbank Offered Rate (LIBOR) | Successor Credit Agreement | Term Loan | Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Basis spread on variable rate | 3.50% | 4.50% |  |
Floor interest rate | 1.00% | 1.00% |  |

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