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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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