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Recent Transactions (Details) - Successor - Drilling Participation Agreement - NW Stack $ in Millions	3 Months Ended
	Sep. 30, 2017 USD ($)
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Percent of development costs to be funded	10.00%
Initial working interest per well	20.00%
Working interest per well if achievement of 10% IRR	65.00%
Working interest per well if achievement of 15% IRR	89.00%
Private Investment Fund
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Drilling participation agreement commitment	$ 200.0
Percent of development costs to be funded	90.00%
Drilling costs to be funded	$ 100.0
Initial working interest per well	80.00%
Optional additional funding	$ 100.0
Working interest per well if achievement of 10% IRR	35.00%
Working interest per well if achievement of 15% IRR	11.00%

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