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Issuance of Equity Securities (Details) $ / shares in Units, $ in Millions |  |  | 2 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2018 shares | Apr. 01, 2017 USD ($) days $ / shares shares | Feb. 19, 2018 shares | Dec. 31, 2017 shares | Dec. 31, 2017 shares | Jul. 03, 2017
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Treasury stock, shares, acquired |  |  |  |  | 5,800,000 |
Effect of Plan |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Common stock, outstanding (in shares) |  |  |  | 130,700,000 | 130,700,000 |
Warrant | Effect of Plan |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Number of securities called by each right |  | 1 |  |  |  |
Exercise price | $ / shares |  | $ 0.01 |  |  |  |
Warrants issued (in shares) |  | 6,200,000 |  |  |  |
Warrants unexercised, percent |  |  |  |  |  | 0.10%
Preferred Stock |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Conversion of Stock, Shares Converted |  |  |  |  | 17,200,000 |
Series A Preferred Stock | Preferred Stock | Effect of Plan |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Preferred stock, dividend rate |  | 8.50% |  |  |  |
Preferred stock, conversion price (in dollars per share) | $ / shares |  | $ 16.25 |  |  |  |
Discount percent of common stock value |  | 35.00% |  |  |  |
Threshold price of common stock | $ / shares |  | $ 32.50 |  |  |  |
Threshold trading days | days |  | 45 |  |  |  |
Threshold consecutive trading days | days |  | 60 |  |  |  |
Threshold last trading days in consecutive trading period | days |  | 20 |  |  |  |
Conversion period threshold after initial issuance |  | 3 years |  |  |  |
Section 1145 Securities | Effect of Plan |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Stock issued | $ |  | $ 704.4 |  |  |  |
Section 1145 Securities | Common Stock | Effect of Plan |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
New shares issued (in shares) |  | 51,200,000 |  |  |  |
Section 1145 Securities | Warrant | Effect of Plan |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
New shares issued (in shares) |  | 2,900,000 |  |  |  |
Parties to Private Placement and Backstop Commitment Agreement | Section 4(a)(2) Securities | Common Stock | Effect of Plan |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
New shares issued (in shares) |  | 4,800,000 |  |  |  |
Parties to Private Placement and Backstop Commitment Agreement | Section 4(a)(2) Securities | Warrant | Effect of Plan |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
New shares issued (in shares) |  | 3,100,000 |  |  |  |
Parties to Private Placement Agreement | Section 4(a)(2) Securities | Preferred Stock | Effect of Plan |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Stock issued | $ |  | $ 750.0 |  |  |  |
Parties to Private Placement Agreement | Section 4(a)(2) Securities | Series A Preferred Stock | Preferred Stock | Effect of Plan |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
New shares issued (in shares) |  | 30,000,000 |  |  |  |
Parties to Backstop Commitment Agreement | Section 4(a)(2) Securities | Effect of Plan |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Stock issued | $ |  | $ 45.6 |  |  |  |
Parties to Backstop Commitment Agreement | Section 4(a)(2) Securities | Common Stock | Effect of Plan |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
New shares issued (in shares) |  | 3,300,000 |  |  |  |
Parties to Backstop Commitment Agreement | Section 4(a)(2) Securities | Warrant | Effect of Plan |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
New shares issued (in shares) |  | 200,000 |  |  |  |
2017 Incentive Plan |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Treasury stock, shares, acquired |  |  |  | 5,800,000 |  |
2017 Incentive Plan | Effect of Plan |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Common stock, outstanding (in shares) |  |  |  | 3,500,000 | 3,500,000 |
Allowed Claims In Classes 2A, 2B, 2C, 2D And 5B | Rights Offering | Effect of Plan |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Units authorized |  | 54,500,000.0 |  |  |  |
Number of securities called by each right |  | 1 |  |  |  |
Exercise price | $ / shares |  | $ 13.75 |  |  |  |
Rights offering, units purchased |  | 51,200,000 |  |  |  |
Allowed Claims In Classes 2A, 2B, 2C, 2D And 5B | Section 1145 Securities | Common Stock | Effect of Plan |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
New shares issued (in shares) |  | 11,600,000 |  |  |  |
Allowed Claims In Classes 2A, 2B, 2C, 2D And 5B | Parties to Backstop Commitment Agreement | Rights Offering | Effect of Plan |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Rights offering, units purchased |  | 3,300,000 |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |
Treasury stock, shares, acquired |  |  | 900,000 |  |  |
Conversion of Stock, Shares Converted | 13,200,000 |  |  |  |  |

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