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Summary of Provisions (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jan. 31, 2018 | Apr. 01, 2017 | Mar. 31, 2018 | Dec. 31, 2017
Successor |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Conversion of Stock, Shares Issued |  |  |  | 6,200,000
Successor | Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Stock and warrants issued, value |  | $ 750,000,000 |  |
Warrants issued (in shares) |  | 6,200,000 |  |
Successor | First Lien Senior Secured Notes | Senior Notes | Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Principal amount |  | 1,000,000,000.0 |  |
Successor | First LIen Credit Facility | Line of Credit | Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Principal amount |  | 950,000,000.0 |  |
Scenario, Forecast |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Conversion of Stock, Amount Issued |  |  | $ 103,000,000 |
Series A Preferred Stock | Successor | Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Preferred stock |  | $ 750,000,000 |  |
Preferred Stock, Shares Issued |  | 30,000,000.0 |  |
Common Stock | Successor |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Conversion of Stock, Shares Issued |  |  |  | 40,000,000
Common Stock | Successor | Effect of Plan |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Stock issued (in shares) |  | $ 70,900,000 |  |
Subsequent Event [Member] |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Conversion of Stock, Shares Issued | 24,800,000 |  |  |

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